20695491 has 6 divisors (see below), whose sum is σ = 29893500. Its totient is φ = 13796988.

The previous prime is 20695483. The next prime is 20695517. The reversal of 20695491 is 19459602.

It is not a de Polignac number, because 20695491 - 2³ = 20695483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20695391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1149741 + ... + 1149758.

It is an arithmetic number, because the mean of its divisors is an integer number (4982250).

Almost surely, 2^20695491 is an apocalyptic number.

20695491 is a deficient number, since it is larger than the sum of its proper divisors (9198009).

20695491 is a wasteful number, since it uses less digits than its factorization.

20695491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299505 (or 2299502 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20695491 is about 4549.2297150177. The cubic root of 20695491 is about 274.5524002407.

The spelling of 20695491 in words is "twenty million, six hundred ninety-five thousand, four hundred ninety-one".