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20102020 = 2251005101
BaseRepresentation
bin100110010101…
…1101110000100
31101211021210021
41030223232010
520121231040
61554504524
7332602321
oct114535604
941737707
1020102020
111038aa44
126895144
13421a9b3
142953b48
151b7124a
hex132bb84

20102020 has 12 divisors (see below), whose sum is σ = 42214284. Its totient is φ = 8040800.

The previous prime is 20102009. The next prime is 20102029. The reversal of 20102020 is 2020102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5494336 + 14607684 = 2344^2 + 3822^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20101994 and 20102012.

It is not an unprimeable number, because it can be changed into a prime (20102029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502531 + ... + 502570.

It is an arithmetic number, because the mean of its divisors is an integer number (3517857).

Almost surely, 220102020 is an apocalyptic number.

20102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102020 is an abundant number, since it is smaller than the sum of its proper divisors (22112264).

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

20102020 is a wasteful number, since it uses less digits than its factorization.

20102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005110 (or 1005108 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 20102020 is about 4483.5276289993. The cubic root of 20102020 is about 271.9025205770.

Adding to 20102020 its reverse (2020102), we get a palindrome (22122122).

The spelling of 20102020 in words is "twenty million, one hundred two thousand, twenty".

Divisors: 1 2 4 5 10 20 1005101 2010202 4020404 5025505 10051010 20102020