20430673520 has 40 divisors (see below), whose sum is σ = 48152032656. Its totient is φ = 8060318208.

The previous prime is 20430673513. The next prime is 20430673537. The reversal of 20430673520 is 2537603402.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1743362 + ... + 1755041.

Almost surely, 2^20430673520 is an apocalyptic number.

20430673520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430673520 is an abundant number, since it is smaller than the sum of its proper divisors (27721359136).

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

20430673520 is a wasteful number, since it uses less digits than its factorization.

20430673520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3498489 (or 3498483 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 32.

The spelling of 20430673520 in words is "twenty billion, four hundred thirty million, six hundred seventy-three thousand, five hundred twenty".