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21020002020 = 22325116777789
BaseRepresentation
bin10011100100111000…
…111100011011100100
32000020220211201222100
4103210320330123210
5321022110031040
613353443332100
71342616032503
oct234470743344
960226751870
1021020002020
118a072746a6
1240a7681030
131c9cac9124
14103595c83a
1583059db30
hex4e4e3c6e4

21020002020 has 36 divisors (see below), whose sum is σ = 63760673340. Its totient is φ = 5605333824.

The previous prime is 21020002001. The next prime is 21020002063. The reversal of 21020002020 is 2020002012.

It can be written as a sum of positive squares in 2 ways, for example, as 13835405376 + 7184596644 = 117624^2 + 84762^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21020001993 and 21020002011.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58388715 + ... + 58389074.

It is an arithmetic number, because the mean of its divisors is an integer number (1771129815).

Almost surely, 221020002020 is an apocalyptic number.

21020002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020002020 is an abundant number, since it is smaller than the sum of its proper divisors (42740671320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020002020 is a wasteful number, since it uses less digits than its factorization.

21020002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116777804 (or 116777799 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 21020002020 its reverse (2020002012), we get a palindrome (23040004032).

The spelling of 21020002020 in words is "twenty-one billion, twenty million, two thousand, twenty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 60 90 180 116777789 233555578 350333367 467111156 583888945 700666734 1051000101 1167777890 1401333468 1751666835 2102000202 2335555780 3503333670 4204000404 5255000505 7006667340 10510001010 21020002020