20312012511 has 12 divisors (see below), whose sum is σ = 33530941392. Its totient is φ = 11606864256.

The previous prime is 20312012503. The next prime is 20312012519. The reversal of 20312012511 is 11521021302.

20312012511 is a `hidden beast` number, since 20 + 3 + 120 + 12 + 511 = 666.

It is an interprime number because it is at equal distance from previous prime (20312012503) and next prime (20312012519).

It is not a de Polignac number, because 20312012511 - 2³ = 20312012503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312012519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161206386 + ... + 161206511.

It is an arithmetic number, because the mean of its divisors is an integer number (2794245116).

Almost surely, 2^20312012511 is an apocalyptic number.

20312012511 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20312012511 is a deficient number, since it is larger than the sum of its proper divisors (13218928881).

20312012511 is a wasteful number, since it uses less digits than its factorization.

20312012511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322412910 (or 322412907 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 20312012511 its reverse (11521021302), we get a palindrome (31833033813).

The spelling of 20312012511 in words is "twenty billion, three hundred twelve million, twelve thousand, five hundred eleven".