20695897 has 8 divisors (see below), whose sum is σ = 21178952. Its totient is φ = 20217600.

The previous prime is 20695891. The next prime is 20695901. The reversal of 20695897 is 79859602.

It can be written as a sum of positive squares in 4 ways, for example, as 47961 + 20647936 = 219^2 + 4544^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20695897 - 2³ = 20695889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20695891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8497 + ... + 10657.

It is an arithmetic number, because the mean of its divisors is an integer number (2647369).

Almost surely, 2^20695897 is an apocalyptic number.

It is an amenable number.

20695897 is a deficient number, since it is larger than the sum of its proper divisors (483055).

20695897 is a wasteful number, since it uses less digits than its factorization.

20695897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 20695897 is about 4549.2743377378. The cubic root of 20695897 is about 274.5541956003.

The spelling of 20695897 in words is "twenty million, six hundred ninety-five thousand, eight hundred ninety-seven".