20693220840 has 96 divisors (see below), whose sum is σ = 67270975200. Its totient is φ = 5516714880.

The previous prime is 20693220817. The next prime is 20693220841. The reversal of 20693220840 is 4802239602.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20693220795 and 20693220804.

It is not an unprimeable number, because it can be changed into a prime (20693220841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2291935 + ... + 2300945.

It is an arithmetic number, because the mean of its divisors is an integer number (700739325).

Almost surely, 2^20693220840 is an apocalyptic number.

20693220840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20693220840 is an abundant number, since it is smaller than the sum of its proper divisors (46577754360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20693220840 is a wasteful number, since it uses less digits than its factorization.

20693220840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15407 (or 15400 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 20693220840 in words is "twenty billion, six hundred ninety-three million, two hundred twenty thousand, eight hundred forty".