20852661 has 4 divisors (see below), whose sum is σ = 27803552. Its totient is φ = 13901772.

The previous prime is 20852639. The next prime is 20852687. The reversal of 20852661 is 16625802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20852661 - 2¹⁰ = 20851637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20852621) 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, 3475441 + ... + 3475446.

It is an arithmetic number, because the mean of its divisors is an integer number (6950888).

Almost surely, 2^20852661 is an apocalyptic number.

It is an amenable number.

20852661 is a deficient number, since it is larger than the sum of its proper divisors (6950891).

20852661 is an equidigital number, since it uses as much as digits as its factorization.

20852661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6950890.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20852661 is about 4566.4713948518. The cubic root of 20852661 is about 275.2456691732.

The spelling of 20852661 in words is "twenty million, eight hundred fifty-two thousand, six hundred sixty-one".