20533164 has 12 divisors (see below), whose sum is σ = 47910744. Its totient is φ = 6844384.

The previous prime is 20533159. The next prime is 20533213. The reversal of 20533164 is 46133502.

It is a happy number.

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

It is a super-2 number, since 2×20533164² = 843221647701792, which contains 22 as substring.

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, 855537 + ... + 855560.

It is an arithmetic number, because the mean of its divisors is an integer number (3992562).

Almost surely, 2^20533164 is an apocalyptic number.

It is an amenable number.

20533164 is an abundant number, since it is smaller than the sum of its proper divisors (27377580).

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

20533164 is a wasteful number, since it uses less digits than its factorization.

20533164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711104 (or 1711102 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20533164 is about 4531.3534401986. The cubic root of 20533164 is about 273.8326895173.

Adding to 20533164 its reverse (46133502), we get a palindrome (66666666).

The spelling of 20533164 in words is "twenty million, five hundred thirty-three thousand, one hundred sixty-four".