20900680 has 16 divisors (see below), whose sum is σ = 47026620. Its totient is φ = 8360256.

The previous prime is 20900669. The next prime is 20900683. The reversal of 20900680 is 8600902.

It can be written as a sum of positive squares in 2 ways, for example, as 20775364 + 125316 = 4558^2 + 354^2 .

It is not an unprimeable number, because it can be changed into a prime (20900683) 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, 261219 + ... + 261298.

Almost surely, 2^20900680 is an apocalyptic number.

20900680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20900680 is an abundant number, since it is smaller than the sum of its proper divisors (26125940).

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

20900680 is a wasteful number, since it uses less digits than its factorization.

20900680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522528 (or 522524 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20900680 is about 4571.7261510287. The cubic root of 20900680 is about 275.4567835480.

The spelling of 20900680 in words is "twenty million, nine hundred thousand, six hundred eighty".