20925138 has 16 divisors (see below), whose sum is σ = 45069696. Its totient is φ = 6438480.

The previous prime is 20925119. The next prime is 20925139. The reversal of 20925138 is 83152902.

It is a happy number.

It is a super-2 number, since 2×20925138² = 875722800638088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20925139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134058 + ... + 134213.

It is an arithmetic number, because the mean of its divisors is an integer number (2816856).

Almost surely, 2^20925138 is an apocalyptic number.

20925138 is an abundant number, since it is smaller than the sum of its proper divisors (24144558).

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

20925138 is a wasteful number, since it uses less digits than its factorization.

20925138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268289.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20925138 is about 4574.4002885624. The cubic root of 20925138 is about 275.5641882798.

The spelling of 20925138 in words is "twenty million, nine hundred twenty-five thousand, one hundred thirty-eight".