20288920 has 32 divisors (see below), whose sum is σ = 46429200. Its totient is φ = 7977088.

The previous prime is 20288909. The next prime is 20288927. The reversal of 20288920 is 2988202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20288927) 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, 1939 + ... + 6658.

Almost surely, 2^20288920 is an apocalyptic number.

20288920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20288920 is an abundant number, since it is smaller than the sum of its proper divisors (26140280).

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

20288920 is a wasteful number, since it uses less digits than its factorization.

20288920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8667 (or 8663 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20288920 is about 4504.3223685700. The cubic root of 20288920 is about 272.7426002160.

The spelling of 20288920 in words is "twenty million, two hundred eighty-eight thousand, nine hundred twenty".