20403111131 has 4 divisors (see below), whose sum is σ = 21972581232. Its totient is φ = 18833641032.

The previous prime is 20403111121. The next prime is 20403111139. The reversal of 20403111131 is 13111130402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13111130402 = 2 ⋅6555565201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20403111131 is a prime.

It is a super-2 number, since 2×20403111131² (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 (20403111139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784735031 + ... + 784735056.

It is an arithmetic number, because the mean of its divisors is an integer number (5493145308).

Almost surely, 2^20403111131 is an apocalyptic number.

20403111131 is a deficient number, since it is larger than the sum of its proper divisors (1569470101).

20403111131 is a wasteful number, since it uses less digits than its factorization.

20403111131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569470100.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20403111131 its reverse (13111130402), we get a palindrome (33514241533).

The spelling of 20403111131 in words is "twenty billion, four hundred three million, one hundred eleven thousand, one hundred thirty-one".