20000015397 has 32 divisors (see below), whose sum is σ = 30602880000. Its totient is φ = 12895882560.

The previous prime is 20000015377. The next prime is 20000015419. The reversal of 20000015397 is 79351000002.

It is not a de Polignac number, because 20000015397 - 2¹⁶ = 19999949861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20000015397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000015377) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1725979 + ... + 1737527.

It is an arithmetic number, because the mean of its divisors is an integer number (956340000).

Almost surely, 2^20000015397 is an apocalyptic number.

20000015397 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20000015397 is a deficient number, since it is larger than the sum of its proper divisors (10602864603).

20000015397 is a wasteful number, since it uses less digits than its factorization.

20000015397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13658 (or 13652 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

Adding to 20000015397 its reverse (79351000002), we get a palindrome (99351015399).

The spelling of 20000015397 in words is "twenty billion, fifteen thousand, three hundred ninety-seven".