20695917 has 16 divisors (see below), whose sum is σ = 30673728. Its totient is φ = 12305280.

The previous prime is 20695903. The next prime is 20695949. The reversal of 20695917 is 71959602.

It is not a de Polignac number, because 20695917 - 2⁴ = 20695901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20695957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4168 + ... + 7665.

It is an arithmetic number, because the mean of its divisors is an integer number (1917108).

Almost surely, 2^20695917 is an apocalyptic number.

It is an amenable number.

20695917 is a deficient number, since it is larger than the sum of its proper divisors (9977811).

20695917 is a wasteful number, since it uses less digits than its factorization.

20695917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11900.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 20695917 is about 4549.2765358901. The cubic root of 20695917 is about 274.5542840410.

It can be divided in two parts, 20695 and 917, that added together give a palindrome (21612).

The spelling of 20695917 in words is "twenty million, six hundred ninety-five thousand, nine hundred seventeen".