20571264 has 96 divisors (see below), whose sum is σ = 67679040. Its totient is φ = 5875200.

The previous prime is 20571253. The next prime is 20571283. The reversal of 20571264 is 46217502.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6789 + ... + 9339.

It is an arithmetic number, because the mean of its divisors is an integer number (704990).

Almost surely, 2^20571264 is an apocalyptic number.

20571264 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 20571264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33839520).

20571264 is an abundant number, since it is smaller than the sum of its proper divisors (47107776).

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

20571264 is a wasteful number, since it uses less digits than its factorization.

20571264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578 (or 2563 counting only the distinct ones).

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

The square root of 20571264 is about 4535.5555337797. Note that the first 4 decimals coincide. The cubic root of 20571264 is about 274.0019535620.

Adding to 20571264 its reverse (46217502), we get a palindrome (66788766).

It can be divided in two parts, 2057 and 1264, that added together give a triangular number (3321 = T₈₁).

The spelling of 20571264 in words is "twenty million, five hundred seventy-one thousand, two hundred sixty-four".