20425766731 has 4 divisors (see below), whose sum is σ = 21084662464. Its totient is φ = 19766871000.

The previous prime is 20425766693. The next prime is 20425766737. The reversal of 20425766731 is 13766752402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20425766731 - 2¹⁹ = 20425242443 is a prime.

It is a super-2 number, since 2×20425766731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20425766737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329447820 + ... + 329447881.

It is an arithmetic number, because the mean of its divisors is an integer number (5271165616).

Almost surely, 2^20425766731 is an apocalyptic number.

20425766731 is a deficient number, since it is larger than the sum of its proper divisors (658895733).

20425766731 is an equidigital number, since it uses as much as digits as its factorization.

20425766731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658895732.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 20425766731 in words is "twenty billion, four hundred twenty-five million, seven hundred sixty-six thousand, seven hundred thirty-one".