20145959731 has 2 divisors, whose sum is σ = 20145959732. Its totient is φ = 20145959730.

The previous prime is 20145959707. The next prime is 20145959741. The reversal of 20145959731 is 13795954102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20145959731 - 2¹¹ = 20145957683 is a prime.

It is a super-2 number, since 2×20145959731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20145959741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072979865 + 10072979866.

It is an arithmetic number, because the mean of its divisors is an integer number (10072979866).

Almost surely, 2^20145959731 is an apocalyptic number.

20145959731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145959731 is an equidigital number, since it uses as much as digits as its factorization.

20145959731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 46.

The spelling of 20145959731 in words is "twenty billion, one hundred forty-five million, nine hundred fifty-nine thousand, seven hundred thirty-one".