20869572 has 24 divisors (see below), whose sum is σ = 50267392. Its totient is φ = 6732000.

The previous prime is 20869567. The next prime is 20869573. The reversal of 20869572 is 27596802.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20869572.

It is not an unprimeable number, because it can be changed into a prime (20869573) 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, 27679 + ... + 28422.

Almost surely, 2^20869572 is an apocalyptic number.

It is an amenable number.

20869572 is an abundant number, since it is smaller than the sum of its proper divisors (29397820).

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

20869572 is a wasteful number, since it uses less digits than its factorization.

20869572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56139 (or 56137 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 20869572 is about 4568.3226681135. The cubic root of 20869572 is about 275.3200549123.

The spelling of 20869572 in words is "twenty million, eight hundred sixty-nine thousand, five hundred seventy-two".