20091264 has 32 divisors (see below), whose sum is σ = 53368440. Its totient is φ = 6696960.

The previous prime is 20091257. The next prime is 20091289. The reversal of 20091264 is 46219002.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 25777 + ... + 26544.

Almost surely, 2^20091264 is an apocalyptic number.

20091264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20091264 is an abundant number, since it is smaller than the sum of its proper divisors (33277176).

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

20091264 is an equidigital number, since it uses as much as digits as its factorization.

20091264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52338 (or 52326 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20091264 is about 4482.3279665817. The cubic root of 20091264 is about 271.8540162428.

The spelling of 20091264 in words is "twenty million, ninety-one thousand, two hundred sixty-four".