20339425731 has 4 divisors (see below), whose sum is σ = 27119234312. Its totient is φ = 13559617152.

The previous prime is 20339425727. The next prime is 20339425747. The reversal of 20339425731 is 13752493302.

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

It is not a de Polignac number, because 20339425731 - 2² = 20339425727 is a prime.

It is a super-2 number, since 2×20339425731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20339425731.

It is not an unprimeable number, because it can be changed into a prime (20339425781) 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, 3389904286 + ... + 3389904291.

It is an arithmetic number, because the mean of its divisors is an integer number (6779808578).

Almost surely, 2^20339425731 is an apocalyptic number.

20339425731 is a deficient number, since it is larger than the sum of its proper divisors (6779808581).

20339425731 is an equidigital number, since it uses as much as digits as its factorization.

20339425731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779808580.

The product of its (nonzero) digits is 136080, while the sum is 39.

The spelling of 20339425731 in words is "twenty billion, three hundred thirty-nine million, four hundred twenty-five thousand, seven hundred thirty-one".