20111020131 has 8 divisors (see below), whose sum is σ = 26816361664. Its totient is φ = 13406512680.

The previous prime is 20111020123. The next prime is 20111020133. The reversal of 20111020131 is 13102011102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20111020131 - 2³ = 20111020123 is a prime.

It is a super-2 number, since 2×20111020131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111020133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149905 + ... + 250386.

It is an arithmetic number, because the mean of its divisors is an integer number (3352045208).

Almost surely, 2^20111020131 is an apocalyptic number.

20111020131 is a deficient number, since it is larger than the sum of its proper divisors (6705341533).

20111020131 is a wasteful number, since it uses less digits than its factorization.

20111020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417041.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 20111020131 its reverse (13102011102), we get a palindrome (33213031233).

The spelling of 20111020131 in words is "twenty billion, one hundred eleven million, twenty thousand, one hundred thirty-one".