20431102137 has 16 divisors (see below), whose sum is σ = 27459717120. Its totient is φ = 13512046352.

The previous prime is 20431102121. The next prime is 20431102171. The reversal of 20431102137 is 73120113402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20431102137 - 2⁴ = 20431102121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20431102117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134398 + ... + 242744.

It is an arithmetic number, because the mean of its divisors is an integer number (1716232320).

Almost surely, 2^20431102137 is an apocalyptic number.

It is an amenable number.

20431102137 is a deficient number, since it is larger than the sum of its proper divisors (7028614983).

20431102137 is a wasteful number, since it uses less digits than its factorization.

20431102137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108852.

The product of its (nonzero) digits is 1008, while the sum is 24.

Adding to 20431102137 its reverse (73120113402), we get a palindrome (93551215539).

The spelling of 20431102137 in words is "twenty billion, four hundred thirty-one million, one hundred two thousand, one hundred thirty-seven".