20715898 has 16 divisors (see below), whose sum is σ = 36184320. Its totient is φ = 8710416.

The previous prime is 20715853. The next prime is 20715899. The reversal of 20715898 is 89851702.

It is a self number, because there is not a number n which added to its sum of digits gives 20715898.

It is not an unprimeable number, because it can be changed into a prime (20715899) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13218 + ... + 14701.

It is an arithmetic number, because the mean of its divisors is an integer number (2261520).

Almost surely, 2^20715898 is an apocalyptic number.

20715898 is a deficient number, since it is larger than the sum of its proper divisors (15468422).

20715898 is a wasteful number, since it uses less digits than its factorization.

20715898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27981.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 20715898 is about 4551.4720695617. The cubic root of 20715898 is about 274.6426123272.

The spelling of 20715898 in words is "twenty million, seven hundred fifteen thousand, eight hundred ninety-eight".