19664970 has 32 divisors (see below), whose sum is σ = 50827392. Its totient is φ = 4840512.

The previous prime is 19664951. The next prime is 19664993. The reversal of 19664970 is 7946691.

It is a super-2 number, since 2×19664970² = 773422090201800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24822 + ... + 25601.

It is an arithmetic number, because the mean of its divisors is an integer number (1588356).

Almost surely, 2^19664970 is an apocalyptic number.

19664970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19664970 is an abundant number, since it is smaller than the sum of its proper divisors (31162422).

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

19664970 is a wasteful number, since it uses less digits than its factorization.

19664970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50446.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 19664970 is about 4434.5202671766. The cubic root of 19664970 is about 269.9175331135.

The spelling of 19664970 in words is "nineteen million, six hundred sixty-four thousand, nine hundred seventy".