20340399331431 has 24 divisors (see below), whose sum is σ = 29429084099376. Its totient is φ = 13537896503040.

The previous prime is 20340399331379. The next prime is 20340399331477. The reversal of 20340399331431 is 13413399304302.

20340399331431 is a `hidden beast` number, since 203 + 4 + 0 + 3 + 9 + 9 + 3 + 3 + 1 + 431 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20340399331431 is a prime.

It is a super-2 number, since 2×20340399331431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340399331531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12628516 + ... + 14147798.

It is an arithmetic number, because the mean of its divisors is an integer number (1226211837474).

Almost surely, 2^{20340399331431} is an apocalyptic number.

20340399331431 is a deficient number, since it is larger than the sum of its proper divisors (9088684767945).

20340399331431 is a wasteful number, since it uses less digits than its factorization.

20340399331431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521743 (or 1521740 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 45.

The spelling of 20340399331431 in words is "twenty trillion, three hundred forty billion, three hundred ninety-nine million, three hundred thirty-one thousand, four hundred thirty-one".