20720910311 has 8 divisors (see below), whose sum is σ = 21297885840. Its totient is φ = 20144827008.

The previous prime is 20720910307. The next prime is 20720910349. The reversal of 20720910311 is 11301902702.

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

It is not a de Polignac number, because 20720910311 - 2² = 20720910307 is a prime.

It is a super-2 number, since 2×20720910311² (a number of 21 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 (20720910011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175826 + ... + 268991.

It is an arithmetic number, because the mean of its divisors is an integer number (2662235730).

Almost surely, 2^20720910311 is an apocalyptic number.

20720910311 is a deficient number, since it is larger than the sum of its proper divisors (576975529).

20720910311 is a wasteful number, since it uses less digits than its factorization.

20720910311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446113.

The product of its (nonzero) digits is 756, while the sum is 26.

The spelling of 20720910311 in words is "twenty billion, seven hundred twenty million, nine hundred ten thousand, three hundred eleven".