20395880 has 32 divisors (see below), whose sum is σ = 47134440. Its totient is φ = 7937280.

The previous prime is 20395853. The next prime is 20395883. The reversal of 20395880 is 8859302.

It can be written as a sum of positive squares in 4 ways, for example, as 19589476 + 806404 = 4426^2 + 898^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20395880.

It is not an unprimeable number, because it can be changed into a prime (20395883) 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, 5411 + ... + 8370.

Almost surely, 2^20395880 is an apocalyptic number.

20395880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20395880 is an abundant number, since it is smaller than the sum of its proper divisors (26738560).

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

20395880 is a wasteful number, since it uses less digits than its factorization.

20395880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13829 (or 13825 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20395880 is about 4516.1798015579. The cubic root of 20395880 is about 273.2210458203.

The spelling of 20395880 in words is "twenty million, three hundred ninety-five thousand, eight hundred eighty".