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21102020 = 2253592939
BaseRepresentation
bin101000001111…
…1110111000100
31110201002112022
41100133313010
520400231040
62032142312
7344235632
oct120376704
943632468
1021102020
1110a03295
127097998
1344aac04
142b34352
151cbc6b5
hex141fdc4

21102020 has 24 divisors (see below), whose sum is σ = 44452800. Its totient is φ = 8414432.

The previous prime is 21101963. The next prime is 21102023. The reversal of 21102020 is 2020112.

It is a junction number, because it is equal to n+sod(n) for n = 21101989 and 21102007.

It is not an unprimeable number, because it can be changed into a prime (21102023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5711 + ... + 8649.

It is an arithmetic number, because the mean of its divisors is an integer number (1852200).

Almost surely, 221102020 is an apocalyptic number.

21102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102020 is an abundant number, since it is smaller than the sum of its proper divisors (23350780).

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

21102020 is a wasteful number, since it uses less digits than its factorization.

21102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307 (or 3305 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21102020 is about 4593.6935030539. The cubic root of 21102020 is about 276.3384666466.

Adding to 21102020 its reverse (2020112), we get a palindrome (23122132).

The spelling of 21102020 in words is "twenty-one million, one hundred two thousand, twenty".

Divisors: 1 2 4 5 10 20 359 718 1436 1795 2939 3590 5878 7180 11756 14695 29390 58780 1055101 2110202 4220404 5275505 10551010 21102020