20898907 has 4 divisors (see below), whose sum is σ = 21293280. Its totient is φ = 20504536.

The previous prime is 20898901. The next prime is 20898931. The reversal of 20898907 is 70989802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20898907 - 2²³ = 12510299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20898901) 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, 197107 + ... + 197212.

It is an arithmetic number, because the mean of its divisors is an integer number (5323320).

Almost surely, 2^20898907 is an apocalyptic number.

20898907 is a deficient number, since it is larger than the sum of its proper divisors (394373).

20898907 is an equidigital number, since it uses as much as digits as its factorization.

20898907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394372.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 20898907 is about 4571.5322376639. The cubic root of 20898907 is about 275.4489943486.

The spelling of 20898907 in words is "twenty million, eight hundred ninety-eight thousand, nine hundred seven".