20901885 has 8 divisors (see below), whose sum is σ = 33443040. Its totient is φ = 11147664.

The previous prime is 20901863. The next prime is 20901889. The reversal of 20901885 is 58810902.

It is a happy number.

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

It is not a de Polignac number, because 20901885 - 2⁶ = 20901821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901889) 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, 696715 + ... + 696744.

It is an arithmetic number, because the mean of its divisors is an integer number (4180380).

Almost surely, 2^20901885 is an apocalyptic number.

It is an amenable number.

20901885 is a deficient number, since it is larger than the sum of its proper divisors (12541155).

20901885 is a wasteful number, since it uses less digits than its factorization.

20901885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393467.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20901885 is about 4571.8579374254. The cubic root of 20901885 is about 275.4620771404.

The spelling of 20901885 in words is "twenty million, nine hundred one thousand, eight hundred eighty-five".