20925530 has 32 divisors (see below), whose sum is σ = 39657600. Its totient is φ = 7938112.

The previous prime is 20925467. The next prime is 20925533. The reversal of 20925530 is 3552902.

It is a self number, because there is not a number n which added to its sum of digits gives 20925530.

It is not an unprimeable number, because it can be changed into a prime (20925533) 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, 16499 + ... + 17721.

It is an arithmetic number, because the mean of its divisors is an integer number (1239300).

Almost surely, 2^20925530 is an apocalyptic number.

20925530 is a deficient number, since it is larger than the sum of its proper divisors (18732070).

20925530 is a wasteful number, since it uses less digits than its factorization.

20925530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 20925530 is about 4574.4431355084. The cubic root of 20925530 is about 275.5659090249.

The spelling of 20925530 in words is "twenty million, nine hundred twenty-five thousand, five hundred thirty".