20912418 has 20 divisors (see below), whose sum is σ = 46859670. Its totient is φ = 6970752.

The previous prime is 20912417. The next prime is 20912453. The reversal of 20912418 is 81421902.

It can be written as a sum of positive squares in only one way, i.e., 19686969 + 1225449 = 4437^2 + 1107^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20912391 and 20912400.

It is not an unprimeable number, because it can be changed into a prime (20912417) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 64383 + ... + 64706.

Almost surely, 2^20912418 is an apocalyptic number.

20912418 is an abundant number, since it is smaller than the sum of its proper divisors (25947252).

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

20912418 is a wasteful number, since it uses less digits than its factorization.

20912418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129103 (or 129094 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 20912418 is about 4573.0097310196. The cubic root of 20912418 is about 275.5083401900.

The spelling of 20912418 in words is "twenty million, nine hundred twelve thousand, four hundred eighteen".