20101664 has 24 divisors (see below), whose sum is σ = 43173648. Its totient is φ = 9136960.

The previous prime is 20101663. The next prime is 20101673. The reversal of 20101664 is 46610102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20101661) 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, 28202 + ... + 28905.

It is an arithmetic number, because the mean of its divisors is an integer number (1798902).

Almost surely, 2^20101664 is an apocalyptic number.

It is an amenable number.

20101664 is an abundant number, since it is smaller than the sum of its proper divisors (23071984).

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

20101664 is a wasteful number, since it uses less digits than its factorization.

20101664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57128 (or 57120 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20101664 is about 4483.4879279418. The cubic root of 20101664 is about 271.9009154668.

Adding to 20101664 its reverse (46610102), we get a palindrome (66711766).

The spelling of 20101664 in words is "twenty million, one hundred one thousand, six hundred sixty-four".