20661464 has 16 divisors (see below), whose sum is σ = 38811120. Its totient is φ = 10311840.

The previous prime is 20661463. The next prime is 20661523. The reversal of 20661464 is 46416602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661463) 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, 3002 + ... + 7094.

It is an arithmetic number, because the mean of its divisors is an integer number (2425695).

Almost surely, 2^20661464 is an apocalyptic number.

It is an amenable number.

20661464 is a deficient number, since it is larger than the sum of its proper divisors (18149656).

20661464 is a wasteful number, since it uses less digits than its factorization.

20661464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4730 (or 4726 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20661464 is about 4545.4883126018. The cubic root of 20661464 is about 274.4018470071.

The spelling of 20661464 in words is "twenty million, six hundred sixty-one thousand, four hundred sixty-four".