20720378631 has 8 divisors (see below), whose sum is σ = 27662914800. Its totient is φ = 13795714112.

The previous prime is 20720378603. The next prime is 20720378633. The reversal of 20720378631 is 13687302702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20720378631 - 2²³ = 20711990023 is a prime.

It is a super-2 number, since 2×20720378631² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20720378631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720378633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4465206 + ... + 4469843.

It is an arithmetic number, because the mean of its divisors is an integer number (3457864350).

Almost surely, 2^20720378631 is an apocalyptic number.

20720378631 is a deficient number, since it is larger than the sum of its proper divisors (6942536169).

20720378631 is an equidigital number, since it uses as much as digits as its factorization.

20720378631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8935825.

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 20720378631 in words is "twenty billion, seven hundred twenty million, three hundred seventy-eight thousand, six hundred thirty-one".