20215964 has 12 divisors (see below), whose sum is σ = 35743344. Its totient is φ = 10003584.

The previous prime is 20215883. The next prime is 20215967. The reversal of 20215964 is 46951202.

It is a happy number.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215967) 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, 25664 + ... + 26439.

It is an arithmetic number, because the mean of its divisors is an integer number (2978612).

Almost surely, 2^20215964 is an apocalyptic number.

It is an amenable number.

20215964 is a deficient number, since it is larger than the sum of its proper divisors (15527380).

20215964 is a wasteful number, since it uses less digits than its factorization.

20215964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52204 (or 52202 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20215964 is about 4496.2166317917. The cubic root of 20215964 is about 272.4152933698.

The spelling of 20215964 in words is "twenty million, two hundred fifteen thousand, nine hundred sixty-four".