20909358 has 24 divisors (see below), whose sum is σ = 45944496. Its totient is φ = 6871200.

The previous prime is 20909347. The next prime is 20909363. The reversal of 20909358 is 85390902.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6903 + ... + 9458.

It is an arithmetic number, because the mean of its divisors is an integer number (1914354).

Almost surely, 2^20909358 is an apocalyptic number.

20909358 is an abundant number, since it is smaller than the sum of its proper divisors (25035138).

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

20909358 is a wasteful number, since it uses less digits than its factorization.

20909358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16440 (or 16437 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20909358 is about 4572.6751470009. The cubic root of 20909358 is about 275.4949016572.

The spelling of 20909358 in words is "twenty million, nine hundred nine thousand, three hundred fifty-eight".