20673399960 has 96 divisors (see below), whose sum is σ = 69677047440. Its totient is φ = 5512904064.

The previous prime is 20673399941. The next prime is 20673399983. The reversal of 20673399960 is 6999337602.

It is a happy number.

It is a super-2 number, since 2×20673399960² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 20673399897 and 20673399906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1053727 + ... + 1073166.

Almost surely, 2^20673399960 is an apocalyptic number.

20673399960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20673399960 is an abundant number, since it is smaller than the sum of its proper divisors (49003647480).

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

20673399960 is a wasteful number, since it uses less digits than its factorization.

20673399960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126919 (or 2126903 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 54.

The spelling of 20673399960 in words is "twenty billion, six hundred seventy-three million, three hundred ninety-nine thousand, nine hundred sixty".