20561652 has 18 divisors (see below), whose sum is σ = 51975378. Its totient is φ = 6853872.

The previous prime is 20561647. The next prime is 20561663. The reversal of 20561652 is 25616502.

20561652 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 1 + 652 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20034576 + 527076 = 4476^2 + 726^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285543 + ... + 285614.

It is an arithmetic number, because the mean of its divisors is an integer number (2887521).

Almost surely, 2^20561652 is an apocalyptic number.

It is an amenable number.

20561652 is an abundant number, since it is smaller than the sum of its proper divisors (31413726).

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

20561652 is a wasteful number, since it uses less digits than its factorization.

20561652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571167 (or 571162 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20561652 is about 4534.4957823335. The cubic root of 20561652 is about 273.9592707677.

The spelling of 20561652 in words is "twenty million, five hundred sixty-one thousand, six hundred fifty-two".