20111220031 has 8 divisors (see below), whose sum is σ = 24336266400. Its totient is φ = 16224177408.

The previous prime is 20111220007. The next prime is 20111220061. The reversal of 20111220031 is 13002211102.

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

It is a cyclic number.

It is not a de Polignac number, because 20111220031 - 2⁷ = 20111219903 is a prime.

It is a super-2 number, since 2×20111220031² (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 = 20111219993 and 20111220020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111220061) 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, 84500806 + ... + 84501043.

It is an arithmetic number, because the mean of its divisors is an integer number (3042033300).

Almost surely, 2^20111220031 is an apocalyptic number.

20111220031 is a deficient number, since it is larger than the sum of its proper divisors (4225046369).

20111220031 is a wasteful number, since it uses less digits than its factorization.

20111220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169001873.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20111220031 its reverse (13002211102), we get a palindrome (33113431133).

It can be divided in two parts, 20111 and 220031, that multiplied together give a square (4425043441 = 66521²).

The spelling of 20111220031 in words is "twenty billion, one hundred eleven million, two hundred twenty thousand, thirty-one".