20736551645031 has 4 divisors (see below), whose sum is σ = 27648735526712. Its totient is φ = 13824367763352.

The previous prime is 20736551644961. The next prime is 20736551645039. The reversal of 20736551645031 is 13054615563702.

It is a happy number.

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

It is not a de Polignac number, because 20736551645031 - 2⁹ = 20736551644519 is a prime.

It is a super-2 number, since 2×20736551645031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736551645039) 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, 3456091940836 + ... + 3456091940841.

It is an arithmetic number, because the mean of its divisors is an integer number (6912183881678).

Almost surely, 2^{20736551645031} is an apocalyptic number.

20736551645031 is a deficient number, since it is larger than the sum of its proper divisors (6912183881681).

20736551645031 is an equidigital number, since it uses as much as digits as its factorization.

20736551645031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6912183881680.

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 20736551645031 in words is "twenty trillion, seven hundred thirty-six billion, five hundred fifty-one million, six hundred forty-five thousand, thirty-one".