20403401331 has 4 divisors (see below), whose sum is σ = 27204535112. Its totient is φ = 13602267552.

The previous prime is 20403401303. The next prime is 20403401339. The reversal of 20403401331 is 13310430402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20403401331 - 2¹⁰ = 20403400307 is a prime.

It is a super-2 number, since 2×20403401331² (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 = 20403401298 and 20403401307.

It is not an unprimeable number, because it can be changed into a prime (20403401339) 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, 3400566886 + ... + 3400566891.

It is an arithmetic number, because the mean of its divisors is an integer number (6801133778).

Almost surely, 2^20403401331 is an apocalyptic number.

20403401331 is a deficient number, since it is larger than the sum of its proper divisors (6801133781).

20403401331 is an equidigital number, since it uses as much as digits as its factorization.

20403401331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801133780.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20403401331 its reverse (13310430402), we get a palindrome (33713831733).

The spelling of 20403401331 in words is "twenty billion, four hundred three million, four hundred one thousand, three hundred thirty-one".