20731405125 has 64 divisors (see below), whose sum is σ = 34864337664. Its totient is φ = 10939622400.

The previous prime is 20731405117. The next prime is 20731405133. The reversal of 20731405125 is 52150413702.

It is an interprime number because it is at equal distance from previous prime (20731405117) and next prime (20731405133).

It is not a de Polignac number, because 20731405125 - 2³ = 20731405117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20731405092 and 20731405101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23477934 + ... + 23478816.

It is an arithmetic number, because the mean of its divisors is an integer number (544755276).

Almost surely, 2^20731405125 is an apocalyptic number.

20731405125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20731405125 is a deficient number, since it is larger than the sum of its proper divisors (14132932539).

20731405125 is a wasteful number, since it uses less digits than its factorization.

20731405125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495 (or 1485 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

Adding to 20731405125 its reverse (52150413702), we get a palindrome (72881818827).

The spelling of 20731405125 in words is "twenty billion, seven hundred thirty-one million, four hundred five thousand, one hundred twenty-five".