20111242431 has 48 divisors (see below), whose sum is σ = 31696304640. Its totient is φ = 11307703680.

The previous prime is 20111242429. The next prime is 20111242447. The reversal of 20111242431 is 13424211102.

It is not a de Polignac number, because 20111242431 - 2¹ = 20111242429 is a prime.

It is a super-2 number, since 2×20111242431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20111242398 and 20111242407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111242831) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3562371 + ... + 3568011.

It is an arithmetic number, because the mean of its divisors is an integer number (660339680).

Almost surely, 2^20111242431 is an apocalyptic number.

20111242431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20111242431 is a deficient number, since it is larger than the sum of its proper divisors (11585062209).

20111242431 is a wasteful number, since it uses less digits than its factorization.

20111242431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6044 (or 6037 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 20111242431 its reverse (13424211102), we get a palindrome (33535453533).

The spelling of 20111242431 in words is "twenty billion, one hundred eleven million, two hundred forty-two thousand, four hundred thirty-one".