20525961 has 4 divisors (see below), whose sum is σ = 27367952. Its totient is φ = 13683972.

The previous prime is 20525941. The next prime is 20525971. The reversal of 20525961 is 16952502.

It is a happy number.

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 20525961 - 2⁵ = 20525929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525941) 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, 3420991 + ... + 3420996.

It is an arithmetic number, because the mean of its divisors is an integer number (6841988).

Almost surely, 2^20525961 is an apocalyptic number.

It is an amenable number.

20525961 is a deficient number, since it is larger than the sum of its proper divisors (6841991).

20525961 is an equidigital number, since it uses as much as digits as its factorization.

20525961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6841990.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 20525961 is about 4530.5585748338. The cubic root of 20525961 is about 273.8006657541.

The spelling of 20525961 in words is "twenty million, five hundred twenty-five thousand, nine hundred sixty-one".