20718464 has 32 divisors (see below), whose sum is σ = 44453640. Its totient is φ = 9561600.

The previous prime is 20718463. The next prime is 20718479. The reversal of 20718464 is 46481702.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20718464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20718463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4562 + ... + 7889.

Almost surely, 2^20718464 is an apocalyptic number.

It is an amenable number.

20718464 is an abundant number, since it is smaller than the sum of its proper divisors (23735176).

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

20718464 is a wasteful number, since it uses less digits than its factorization.

20718464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12478 (or 12466 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 20718464 is about 4551.7539476558. The cubic root of 20718464 is about 274.6539515066.

The spelling of 20718464 in words is "twenty million, seven hundred eighteen thousand, four hundred sixty-four".