20916728031 has 8 divisors (see below), whose sum is σ = 27892650240. Its totient is φ = 13942645592.

The previous prime is 20916728029. The next prime is 20916728047. The reversal of 20916728031 is 13082761902.

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 20916728031 - 2¹ = 20916728029 is a prime.

It is a super-2 number, since 2×20916728031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916728071) 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, 433191 + ... + 479048.

It is an arithmetic number, because the mean of its divisors is an integer number (3486581280).

Almost surely, 2^20916728031 is an apocalyptic number.

20916728031 is a deficient number, since it is larger than the sum of its proper divisors (6975922209).

20916728031 is an equidigital number, since it uses as much as digits as its factorization.

20916728031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919885.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 20916728031 in words is "twenty billion, nine hundred sixteen million, seven hundred twenty-eight thousand, thirty-one".