20402320431 has 8 divisors (see below), whose sum is σ = 27319846320. Its totient is φ = 13543170752.

The previous prime is 20402320429. The next prime is 20402320451. The reversal of 20402320431 is 13402320402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20402320431 - 2¹ = 20402320429 is a prime.

It is a super-2 number, since 2×20402320431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20402320398 and 20402320407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402320451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14593236 + ... + 14594633.

It is an arithmetic number, because the mean of its divisors is an integer number (3414980790).

Almost surely, 2^20402320431 is an apocalyptic number.

20402320431 is a deficient number, since it is larger than the sum of its proper divisors (6917525889).

20402320431 is a wasteful number, since it uses less digits than its factorization.

20402320431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29188105.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20402320431 its reverse (13402320402), we get a palindrome (33804640833).

The spelling of 20402320431 in words is "twenty billion, four hundred two million, three hundred twenty thousand, four hundred thirty-one".