20115102031 has 16 divisors (see below), whose sum is σ = 20894653728. Its totient is φ = 19352361600.

The previous prime is 20115102023. The next prime is 20115102037. The reversal of 20115102031 is 13020151102.

It is a cyclic number.

It is not a de Polignac number, because 20115102031 - 2³ = 20115102023 is a prime.

It is a super-2 number, since 2×20115102031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20115101996 and 20115102014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115102037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1060725 + ... + 1079521.

It is an arithmetic number, because the mean of its divisors is an integer number (1305915858).

Almost surely, 2^20115102031 is an apocalyptic number.

20115102031 is a deficient number, since it is larger than the sum of its proper divisors (779551697).

20115102031 is a wasteful number, since it uses less digits than its factorization.

20115102031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19242.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 20115102031 its reverse (13020151102), we get a palindrome (33135253133).

The spelling of 20115102031 in words is "twenty billion, one hundred fifteen million, one hundred two thousand, thirty-one".