20106137731 has 2 divisors, whose sum is σ = 20106137732. Its totient is φ = 20106137730.

The previous prime is 20106137729. The next prime is 20106137741. The reversal of 20106137731 is 13773160102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20106137731 - 2¹ = 20106137729 is a prime.

It is a super-2 number, since 2×20106137731² (a number of 21 digits) contains 22 as substring.

Together with 20106137729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20106137693 and 20106137702.

It is not a weakly prime, because it can be changed into another prime (20106137741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10053068865 + 10053068866.

It is an arithmetic number, because the mean of its divisors is an integer number (10053068866).

Almost surely, 2^20106137731 is an apocalyptic number.

20106137731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20106137731 is an equidigital number, since it uses as much as digits as its factorization.

20106137731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

Adding to 20106137731 its reverse (13773160102), we get a palindrome (33879297833).

The spelling of 20106137731 in words is "twenty billion, one hundred six million, one hundred thirty-seven thousand, seven hundred thirty-one".