20731406420 has 24 divisors (see below), whose sum is σ = 43539957384. Its totient is φ = 8291799936.

The previous prime is 20731406359. The next prime is 20731406429. The reversal of 20731406420 is 2460413702.

It can be written as a sum of positive squares in 4 ways, for example, as 8751228304 + 11980178116 = 93548^2 + 109454^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731406429) 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, 208934 + ... + 291746.

It is an arithmetic number, because the mean of its divisors is an integer number (1814164891).

Almost surely, 2^20731406420 is an apocalyptic number.

20731406420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20731406420 is an abundant number, since it is smaller than the sum of its proper divisors (22808550964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20731406420 is a wasteful number, since it uses less digits than its factorization.

20731406420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95339 (or 95337 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The spelling of 20731406420 in words is "twenty billion, seven hundred thirty-one million, four hundred six thousand, four hundred twenty".