20991614 has 16 divisors (see below), whose sum is σ = 36122208. Its totient is φ = 8962272.

The previous prime is 20991601. The next prime is 20991653. The reversal of 20991614 is 41619902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172 + ... + 6584.

It is an arithmetic number, because the mean of its divisors is an integer number (2257638).

Almost surely, 2^20991614 is an apocalyptic number.

20991614 is a deficient number, since it is larger than the sum of its proper divisors (15130594).

20991614 is a wasteful number, since it uses less digits than its factorization.

20991614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20991614 is about 4581.6606159776. The cubic root of 20991614 is about 275.8556884023.

The spelling of 20991614 in words is "twenty million, nine hundred ninety-one thousand, six hundred fourteen".