20907282993 has 16 divisors (see below), whose sum is σ = 28015073856. Its totient is φ = 13868997120.

The previous prime is 20907282989. The next prime is 20907283027. The reversal of 20907282993 is 39928270902.

It is not a de Polignac number, because 20907282993 - 2² = 20907282989 is a prime.

It is a super-2 number, since 2×20907282993² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20907282943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527013 + ... + 565293.

It is an arithmetic number, because the mean of its divisors is an integer number (1750942116).

Almost surely, 2^20907282993 is an apocalyptic number.

It is an amenable number.

20907282993 is a deficient number, since it is larger than the sum of its proper divisors (7107790863).

20907282993 is a wasteful number, since it uses less digits than its factorization.

20907282993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39184.

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 20907282993 in words is "twenty billion, nine hundred seven million, two hundred eighty-two thousand, nine hundred ninety-three".