20456988 has 24 divisors (see below), whose sum is σ = 47819520. Its totient is φ = 6806640.

The previous prime is 20456987. The next prime is 20457023. The reversal of 20456988 is 88965402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456981) 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, 7443 + ... + 9813.

It is an arithmetic number, because the mean of its divisors is an integer number (1992480).

Almost surely, 2^20456988 is an apocalyptic number.

It is an amenable number.

20456988 is an abundant number, since it is smaller than the sum of its proper divisors (27362532).

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

20456988 is a wasteful number, since it uses less digits than its factorization.

20456988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097 (or 3095 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20456988 is about 4522.9401941657. The cubic root of 20456988 is about 273.4936391922.

The spelling of 20456988 in words is "twenty million, four hundred fifty-six thousand, nine hundred eighty-eight".