202102010020 has 24 divisors (see below), whose sum is σ = 424488698424. Its totient is φ = 80826617856.

The previous prime is 202102009979. The next prime is 202102010053. The reversal of 202102010020 is 20010201202.

It can be written as a sum of positive squares in 4 ways, for example, as 85613589604 + 116488420416 = 292598^2 + 341304^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 202102009979 and 202102010006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769437 + ... + 998116.

It is an arithmetic number, because the mean of its divisors is an integer number (17687029101).

Almost surely, 2^202102010020 is an apocalyptic number.

202102010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202102010020 is an abundant number, since it is smaller than the sum of its proper divisors (222386688404).

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

202102010020 is a wasteful number, since it uses less digits than its factorization.

202102010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773279 (or 1773277 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 202102010020 its reverse (20010201202), we get a palindrome (222112211222).

The spelling of 202102010020 in words is "two hundred two billion, one hundred two million, ten thousand, twenty".