20715264 has 144 divisors (see below), whose sum is σ = 63691040. Its totient is φ = 6718464.

The previous prime is 20715241. The next prime is 20715271. The reversal of 20715264 is 46251702.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 559854 + ... + 559890.

Almost surely, 2^20715264 is an apocalyptic number.

20715264 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 20715264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31845520).

20715264 is an abundant number, since it is smaller than the sum of its proper divisors (42975776).

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

20715264 is an frugal number, since it uses more digits than its factorization.

20715264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20715264 is about 4551.4024212324. The cubic root of 20715264 is about 274.6398105307.

Adding to 20715264 its reverse (46251702), we get a palindrome (66966966).

The spelling of 20715264 in words is "twenty million, seven hundred fifteen thousand, two hundred sixty-four".