20487264 has 96 divisors (see below), whose sum is σ = 62979840. Its totient is φ = 5709312.

The previous prime is 20487251. The next prime is 20487289. The reversal of 20487264 is 46278402.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28542 + ... + 29250.

It is an arithmetic number, because the mean of its divisors is an integer number (656040).

Almost surely, 2^20487264 is an apocalyptic number.

20487264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20487264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31489920).

20487264 is an abundant number, since it is smaller than the sum of its proper divisors (42492576).

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

20487264 is a wasteful number, since it uses less digits than its factorization.

20487264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 20487264 is about 4526.2858946381. The cubic root of 20487264 is about 273.6284946897.

The spelling of 20487264 in words is "twenty million, four hundred eighty-seven thousand, two hundred sixty-four".