20511964 has 12 divisors (see below), whose sum is σ = 39159288. Its totient is φ = 9323600.

The previous prime is 20511937. The next prime is 20511973. The reversal of 20511964 is 46911502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233047 + ... + 233134.

It is an arithmetic number, because the mean of its divisors is an integer number (3263274).

Almost surely, 2^20511964 is an apocalyptic number.

It is an amenable number.

20511964 is a deficient number, since it is larger than the sum of its proper divisors (18647324).

20511964 is a wasteful number, since it uses less digits than its factorization.

20511964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466196 (or 466194 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20511964 is about 4529.0135791362. The cubic root of 20511964 is about 273.7384151669.

The spelling of 20511964 in words is "twenty million, five hundred eleven thousand, nine hundred sixty-four".