20695881 has 4 divisors (see below), whose sum is σ = 27594512. Its totient is φ = 13797252.

The previous prime is 20695877. The next prime is 20695889. The reversal of 20695881 is 18859602.

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 20695881 - 2² = 20695877 is a prime.

It is a super-2 number, since 2×20695881² = 856638980732322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20695889) 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, 3449311 + ... + 3449316.

It is an arithmetic number, because the mean of its divisors is an integer number (6898628).

Almost surely, 2^20695881 is an apocalyptic number.

It is an amenable number.

20695881 is a deficient number, since it is larger than the sum of its proper divisors (6898631).

20695881 is an equidigital number, since it uses as much as digits as its factorization.

20695881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6898630.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 20695881 is about 4549.2725792153. The cubic root of 20695881 is about 274.5541248476.

The spelling of 20695881 in words is "twenty million, six hundred ninety-five thousand, eight hundred eighty-one".