20918466 has 32 divisors (see below), whose sum is σ = 49222080. Its totient is φ = 6562368.

The previous prime is 20918441. The next prime is 20918467. The reversal of 20918466 is 66481902.

It is a self number, because there is not a number n which added to its sum of digits gives 20918466.

It is not an unprimeable number, because it can be changed into a prime (20918467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10476 + ... + 12311.

It is an arithmetic number, because the mean of its divisors is an integer number (1538190).

Almost surely, 2^20918466 is an apocalyptic number.

20918466 is an abundant number, since it is smaller than the sum of its proper divisors (28303614).

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

20918466 is a wasteful number, since it uses less digits than its factorization.

20918466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22815 (or 22809 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20918466 is about 4573.6709544960. The cubic root of 20918466 is about 275.5348971992.

The spelling of 20918466 in words is "twenty million, nine hundred eighteen thousand, four hundred sixty-six".