20571764 has 12 divisors (see below), whose sum is σ = 36037344. Its totient is φ = 10275384.

The previous prime is 20571743. The next prime is 20571767. The reversal of 20571764 is 46717502.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20571764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20571767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3239 + ... + 7185.

It is an arithmetic number, because the mean of its divisors is an integer number (3003112).

Almost surely, 2^20571764 is an apocalyptic number.

It is an amenable number.

20571764 is a deficient number, since it is larger than the sum of its proper divisors (15465580).

20571764 is a wasteful number, since it uses less digits than its factorization.

20571764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5254 (or 5252 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20571764 is about 4535.6106534843. The cubic root of 20571764 is about 274.0041734850.

The spelling of 20571764 in words is "twenty million, five hundred seventy-one thousand, seven hundred sixty-four".