20918424 has 32 divisors (see below), whose sum is σ = 52715520. Its totient is φ = 6916896.

The previous prime is 20918399. The next prime is 20918441. The reversal of 20918424 is 42481902.

It is a junction number, because it is equal to n+sod(n) for n = 20918391 and 20918400.

It is a congruent number.

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, 384 + ... + 6479.

It is an arithmetic number, because the mean of its divisors is an integer number (1647360).

Almost surely, 2^20918424 is an apocalyptic number.

20918424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20918424 is an abundant number, since it is smaller than the sum of its proper divisors (31797096).

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

20918424 is a wasteful number, since it uses less digits than its factorization.

20918424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6999 (or 6995 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20918424 is about 4573.6663629959. Note that the first 3 decimals coincide. The cubic root of 20918424 is about 275.5347127932.

The spelling of 20918424 in words is "twenty million, nine hundred eighteen thousand, four hundred twenty-four".