20440037731 has 2 divisors, whose sum is σ = 20440037732. Its totient is φ = 20440037730.

The previous prime is 20440037729. The next prime is 20440037773. The reversal of 20440037731 is 13773004402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20440037731 - 2¹ = 20440037729 is a prime.

It is a super-2 number, since 2×20440037731² (a number of 21 digits) contains 22 as substring.

Together with 20440037729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20440037693 and 20440037702.

It is not a weakly prime, because it can be changed into another prime (20440037701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220018865 + 10220018866.

It is an arithmetic number, because the mean of its divisors is an integer number (10220018866).

Almost surely, 2^20440037731 is an apocalyptic number.

20440037731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440037731 is an equidigital number, since it uses as much as digits as its factorization.

20440037731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 31.

The spelling of 20440037731 in words is "twenty billion, four hundred forty million, thirty-seven thousand, seven hundred thirty-one".