20572400 has 30 divisors (see below), whose sum is σ = 49426152. Its totient is φ = 8228800.

The previous prime is 20572399. The next prime is 20572429. The reversal of 20572400 is 427502.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 25316 + ... + 26115.

Almost surely, 2^20572400 is an apocalyptic number.

20572400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20572400 is an abundant number, since it is smaller than the sum of its proper divisors (28853752).

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

20572400 is a wasteful number, since it uses less digits than its factorization.

20572400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51449 (or 51438 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20572400 is about 4535.6807647805. The cubic root of 20572400 is about 274.0069971751.

Adding to 20572400 its reverse (427502), we get a palindrome (20999902).

The spelling of 20572400 in words is "twenty million, five hundred seventy-two thousand, four hundred".