20400341231 has 4 divisors (see below), whose sum is σ = 20401851912. Its totient is φ = 20398830552.

The previous prime is 20400341219. The next prime is 20400341243. The reversal of 20400341231 is 13214300402.

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

It is an interprime number because it is at equal distance from previous prime (20400341219) and next prime (20400341243).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400341231 is a prime.

It is a super-2 number, since 2×20400341231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400343231) 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, 734900 + ... + 762153.

It is an arithmetic number, because the mean of its divisors is an integer number (5100462978).

Almost surely, 2^20400341231 is an apocalyptic number.

20400341231 is a deficient number, since it is larger than the sum of its proper divisors (1510681).

20400341231 is a wasteful number, since it uses less digits than its factorization.

20400341231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510680.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20400341231 its reverse (13214300402), we get a palindrome (33614641633).

The spelling of 20400341231 in words is "twenty billion, four hundred million, three hundred forty-one thousand, two hundred thirty-one".