20400151332431 has 4 divisors (see below), whose sum is σ = 21969393742632. Its totient is φ = 18830908922232.

The previous prime is 20400151332413. The next prime is 20400151332433. The reversal of 20400151332431 is 13423315100402.

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

It is a cyclic number.

It is not a de Polignac number, because 20400151332431 - 2⁶ = 20400151332367 is a prime.

It is a super-2 number, since 2×20400151332431² (a number of 27 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 = 20400151332394 and 20400151332403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400151332433) 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, 784621205081 + ... + 784621205106.

It is an arithmetic number, because the mean of its divisors is an integer number (5492348435658).

Almost surely, 2^{20400151332431} is an apocalyptic number.

20400151332431 is a deficient number, since it is larger than the sum of its proper divisors (1569242410201).

20400151332431 is a wasteful number, since it uses less digits than its factorization.

20400151332431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569242410200.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 20400151332431 its reverse (13423315100402), we get a palindrome (33823466432833).

The spelling of 20400151332431 in words is "twenty trillion, four hundred billion, one hundred fifty-one million, three hundred thirty-two thousand, four hundred thirty-one".