20870895 has 8 divisors (see below), whose sum is σ = 33393456. Its totient is φ = 11131136.

The previous prime is 20870887. The next prime is 20870909. The reversal of 20870895 is 59807802.

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 20870895 - 2³ = 20870887 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695682 + ... + 695711.

It is an arithmetic number, because the mean of its divisors is an integer number (4174182).

Almost surely, 2^20870895 is an apocalyptic number.

20870895 is a deficient number, since it is larger than the sum of its proper divisors (12522561).

20870895 is a wasteful number, since it uses less digits than its factorization.

20870895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391401.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 20870895 is about 4568.4674673242. The cubic root of 20870895 is about 275.3258726443.

The spelling of 20870895 in words is "twenty million, eight hundred seventy thousand, eight hundred ninety-five".