20569650 has 24 divisors (see below), whose sum is σ = 51013104. Its totient is φ = 5485200.

The previous prime is 20569649. The next prime is 20569657. The reversal of 20569650 is 5696502.

It is a super-2 number, since 2×20569650² = 846221002245000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20569657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68416 + ... + 68715.

It is an arithmetic number, because the mean of its divisors is an integer number (2125546).

Almost surely, 2^20569650 is an apocalyptic number.

20569650 is an abundant number, since it is smaller than the sum of its proper divisors (30443454).

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

20569650 is a wasteful number, since it uses less digits than its factorization.

20569650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137146 (or 137141 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 20569650 is about 4535.3776028022. The cubic root of 20569650 is about 273.9947874051.

The spelling of 20569650 in words is "twenty million, five hundred sixty-nine thousand, six hundred fifty".