20406924 has 24 divisors (see below), whose sum is σ = 52907120. Its totient is φ = 6802272.

The previous prime is 20406917. The next prime is 20406941. The reversal of 20406924 is 42960402.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94369 + ... + 94584.

Almost surely, 2^20406924 is an apocalyptic number.

It is an amenable number.

20406924 is an abundant number, since it is smaller than the sum of its proper divisors (32500196).

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

20406924 is a wasteful number, since it uses less digits than its factorization.

20406924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188966 (or 188958 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20406924 is about 4517.4023509092. The cubic root of 20406924 is about 273.2703516730.

The spelling of 20406924 in words is "twenty million, four hundred six thousand, nine hundred twenty-four".