20561732 has 12 divisors (see below), whose sum is σ = 36039276. Its totient is φ = 10264800.

The previous prime is 20561731. The next prime is 20561753. The reversal of 20561732 is 23716502.

It can be written as a sum of positive squares in 2 ways, for example, as 7268416 + 13293316 = 2696^2 + 3646^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20561731) 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, 863 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (3003273).

Almost surely, 2^20561732 is an apocalyptic number.

It is an amenable number.

20561732 is a deficient number, since it is larger than the sum of its proper divisors (15477544).

20561732 is a wasteful number, since it uses less digits than its factorization.

20561732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8038 (or 8036 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20561732 is about 4534.5046035923. The cubic root of 20561732 is about 273.9596260685.

The spelling of 20561732 in words is "twenty million, five hundred sixty-one thousand, seven hundred thirty-two".