20120402031111 has 24 divisors (see below), whose sum is σ = 29573660065040. Its totient is φ = 13179810848256.

The previous prime is 20120402031089. The next prime is 20120402031133. The reversal of 20120402031111 is 11113020402102.

20120402031111 is a `hidden beast` number, since 2 + 0 + 120 + 402 + 0 + 31 + 111 = 666.

It is an interprime number because it is at equal distance from previous prime (20120402031089) and next prime (20120402031133).

It is a de Polignac number, because none of the positive numbers 2^k-20120402031111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120402031151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82783060 + ... + 83025753.

Almost surely, 2^{20120402031111} is an apocalyptic number.

20120402031111 is a deficient number, since it is larger than the sum of its proper divisors (9453258033929).

20120402031111 is a wasteful number, since it uses less digits than its factorization.

20120402031111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165809055 (or 165809052 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20120402031111 its reverse (11113020402102), we get a palindrome (31233422433213).

The spelling of 20120402031111 in words is "twenty trillion, one hundred twenty billion, four hundred two million, thirty-one thousand, one hundred eleven".