20117964 has 12 divisors (see below), whose sum is σ = 46941944. Its totient is φ = 6705984.

The previous prime is 20117963. The next prime is 20117971. The reversal of 20117964 is 46971102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20117963) 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, 838237 + ... + 838260.

Almost surely, 2^20117964 is an apocalyptic number.

It is an amenable number.

20117964 is an abundant number, since it is smaller than the sum of its proper divisors (26823980).

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

20117964 is a wasteful number, since it uses less digits than its factorization.

20117964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676504 (or 1676502 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20117964 is about 4485.3053407767. The cubic root of 20117964 is about 271.9743884478.

The spelling of 20117964 in words is "twenty million, one hundred seventeen thousand, nine hundred sixty-four".