20401420431 has 12 divisors (see below), whose sum is σ = 31643019672. Its totient is φ = 11657954448.

The previous prime is 20401420397. The next prime is 20401420513. The reversal of 20401420431 is 13402410402.

It is not a de Polignac number, because 20401420431 - 2⁹ = 20401419919 is a prime.

It is a super-2 number, since 2×20401420431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20401420398 and 20401420407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401421431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69392440 + ... + 69392733.

It is an arithmetic number, because the mean of its divisors is an integer number (2636918306).

Almost surely, 2^20401420431 is an apocalyptic number.

20401420431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20401420431 is a deficient number, since it is larger than the sum of its proper divisors (11241599241).

20401420431 is a wasteful number, since it uses less digits than its factorization.

20401420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138785190 (or 138785183 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20401420431 its reverse (13402410402), we get a palindrome (33803830833).

The spelling of 20401420431 in words is "twenty billion, four hundred one million, four hundred twenty thousand, four hundred thirty-one".