20989395 has 96 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 9035712.

The previous prime is 20989393. The next prime is 20989421. The reversal of 20989395 is 59398902.

It is not a de Polignac number, because 20989395 - 2¹ = 20989393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20989395.

It is not an unprimeable number, because it can be changed into a prime (20989391) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 125602 + ... + 125768.

It is an arithmetic number, because the mean of its divisors is an integer number (478800).

Almost surely, 2^20989395 is an apocalyptic number.

20989395 is an abundant number, since it is smaller than the sum of its proper divisors (24975405).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20989395 is a wasteful number, since it uses less digits than its factorization.

20989395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 20989395 is about 4581.4184484720. The cubic root of 20989395 is about 275.8459679279.

The spelling of 20989395 in words is "twenty million, nine hundred eighty-nine thousand, three hundred ninety-five".