20925018 has 12 divisors (see below), whose sum is σ = 45337578. Its totient is φ = 6975000.

The previous prime is 20924987. The next prime is 20925019. The reversal of 20925018 is 81052902.

It can be written as a sum of positive squares in only one way, i.e., 12299049 + 8625969 = 3507^2 + 2937^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20924982 and 20925000.

It is not an unprimeable number, because it can be changed into a prime (20925019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 581233 + ... + 581268.

Almost surely, 2^20925018 is an apocalyptic number.

20925018 is an abundant number, since it is smaller than the sum of its proper divisors (24412560).

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

20925018 is a wasteful number, since it uses less digits than its factorization.

20925018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162509 (or 1162506 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20925018 is about 4574.3871720702. The cubic root of 20925018 is about 275.5636615168.

The spelling of 20925018 in words is "twenty million, nine hundred twenty-five thousand, eighteen".