20398820815 has 16 divisors (see below), whose sum is σ = 25235380800. Its totient is φ = 15819598080.

The previous prime is 20398820803. The next prime is 20398820833. The reversal of 20398820815 is 51802889302.

It is not a de Polignac number, because 20398820815 - 2¹¹ = 20398818767 is a prime.

It is a super-2 number, since 2×20398820815² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284715 + ... + 349084.

It is an arithmetic number, because the mean of its divisors is an integer number (1577211300).

Almost surely, 2^20398820815 is an apocalyptic number.

20398820815 is a deficient number, since it is larger than the sum of its proper divisors (4836559985).

20398820815 is a wasteful number, since it uses less digits than its factorization.

20398820815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634002.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 20398820815 in words is "twenty billion, three hundred ninety-eight million, eight hundred twenty thousand, eight hundred fifteen".