20309198520 has 64 divisors (see below), whose sum is σ = 65614338720. Its totient is φ = 4999186944.

The previous prime is 20309198471. The next prime is 20309198521. The reversal of 20309198520 is 2589190302.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20309198521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6507799 + ... + 6510918.

Almost surely, 2^20309198520 is an apocalyptic number.

20309198520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20309198520 is an abundant number, since it is smaller than the sum of its proper divisors (45305140200).

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

20309198520 is a wasteful number, since it uses less digits than its factorization.

20309198520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13018744 (or 13018740 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 20309198520 in words is "twenty billion, three hundred nine million, one hundred ninety-eight thousand, five hundred twenty".