20901895 has 16 divisors (see below), whose sum is σ = 29655360. Its totient is φ = 13837824.

The previous prime is 20901889. The next prime is 20901901. The reversal of 20901895 is 59810902.

20901895 is nontrivially palindromic in base 12.

It is an interprime number because it is at equal distance from previous prime (20901889) and next prime (20901901).

It is not a de Polignac number, because 20901895 - 2⁵ = 20901863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20901895.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9282 + ... + 11311.

It is an arithmetic number, because the mean of its divisors is an integer number (1853460).

Almost surely, 2^20901895 is an apocalyptic number.

20901895 is a deficient number, since it is larger than the sum of its proper divisors (8753465).

20901895 is a wasteful number, since it uses less digits than its factorization.

20901895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20634.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 20901895 is about 4571.8590310726. The cubic root of 20901895 is about 275.4621210698.

The spelling of 20901895 in words is "twenty million, nine hundred one thousand, eight hundred ninety-five".