20403313131 has 16 divisors (see below), whose sum is σ = 27468587520. Its totient is φ = 13470256800.

The previous prime is 20403313111. The next prime is 20403313159. The reversal of 20403313131 is 13131330402.

It is not a de Polignac number, because 20403313131 - 2¹⁰ = 20403312107 is a prime.

It is a super-2 number, since 2×20403313131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20403313098 and 20403313107.

It is not an unprimeable number, because it can be changed into a prime (20403313111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 639406 + ... + 670556.

It is an arithmetic number, because the mean of its divisors is an integer number (1716786720).

Almost surely, 2^20403313131 is an apocalyptic number.

20403313131 is a deficient number, since it is larger than the sum of its proper divisors (7065274389).

20403313131 is a wasteful number, since it uses less digits than its factorization.

20403313131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33266.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20403313131 its reverse (13131330402), we get a palindrome (33534643533).

The spelling of 20403313131 in words is "twenty billion, four hundred three million, three hundred thirteen thousand, one hundred thirty-one".