20572499 has 16 divisors (see below), whose sum is σ = 22763520. Its totient is φ = 18506880.

The previous prime is 20572457. The next prime is 20572507. The reversal of 20572499 is 99427502.

It is not a de Polignac number, because 20572499 - 2⁸ = 20572243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20572429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54092 + ... + 54470.

It is an arithmetic number, because the mean of its divisors is an integer number (1422720).

Almost surely, 2^20572499 is an apocalyptic number.

20572499 is a deficient number, since it is larger than the sum of its proper divisors (2191021).

20572499 is a wasteful number, since it uses less digits than its factorization.

20572499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 20572499 is about 4535.6916782339. The cubic root of 20572499 is about 274.0074367065.

The spelling of 20572499 in words is "twenty million, five hundred seventy-two thousand, four hundred ninety-nine".