20312101511 has 32 divisors (see below), whose sum is σ = 22976593920. Its totient is φ = 17828553600.

The previous prime is 20312101501. The next prime is 20312101567. The reversal of 20312101511 is 11510121302.

It is a de Polignac number, because none of the positive numbers 2^k-20312101511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20312101511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312101501) 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, 7098221 + ... + 7101081.

It is an arithmetic number, because the mean of its divisors is an integer number (718018560).

Almost surely, 2^20312101511 is an apocalyptic number.

20312101511 is a deficient number, since it is larger than the sum of its proper divisors (2664492409).

20312101511 is a wasteful number, since it uses less digits than its factorization.

20312101511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3207.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 20312101511 its reverse (11510121302), we get a palindrome (31822222813).

The spelling of 20312101511 in words is "twenty billion, three hundred twelve million, one hundred one thousand, five hundred eleven".