20703071731 has 4 divisors (see below), whose sum is σ = 20706287464. Its totient is φ = 20699856000.

The previous prime is 20703071617. The next prime is 20703071747. The reversal of 20703071731 is 13717030702.

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

It is a cyclic number.

It is not a de Polignac number, because 20703071731 - 2⁷ = 20703071603 is a prime.

It is a super-2 number, since 2×20703071731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20703071693 and 20703071702.

It is not an unprimeable number, because it can be changed into a prime (20703071761) 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, 1598190 + ... + 1611091.

It is an arithmetic number, because the mean of its divisors is an integer number (5176571866).

Almost surely, 2^20703071731 is an apocalyptic number.

20703071731 is a deficient number, since it is larger than the sum of its proper divisors (3215733).

20703071731 is an equidigital number, since it uses as much as digits as its factorization.

20703071731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215732.

The product of its (nonzero) digits is 6174, while the sum is 31.

The spelling of 20703071731 in words is "twenty billion, seven hundred three million, seventy-one thousand, seven hundred thirty-one".