20371664 has 20 divisors (see below), whose sum is σ = 39835620. Its totient is φ = 10091520.

The previous prime is 20371597. The next prime is 20371669. The reversal of 20371664 is 46617302.

It can be written as a sum of positive squares in 2 ways, for example, as 12306064 + 8065600 = 3508^2 + 2840^2 .

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (20371669) 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, 4097 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (1991781).

Almost surely, 2^20371664 is an apocalyptic number.

It is an amenable number.

20371664 is a deficient number, since it is larger than the sum of its proper divisors (19463956).

20371664 is a wasteful number, since it uses less digits than its factorization.

20371664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11798 (or 11792 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20371664 is about 4513.4979782869. The cubic root of 20371664 is about 273.1128713411.

Adding to 20371664 its reverse (46617302), we get a palindrome (66988966).

The spelling of 20371664 in words is "twenty million, three hundred seventy-one thousand, six hundred sixty-four".