20423849520 has 80 divisors (see below), whose sum is σ = 63359917920. Its totient is φ = 5442404352.

The previous prime is 20423849497. The next prime is 20423849527. The reversal of 20423849520 is 2594832402.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (20423849527) 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, 307962 + ... + 368358.

It is an arithmetic number, because the mean of its divisors is an integer number (791998974).

Almost surely, 2^20423849520 is an apocalyptic number.

20423849520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20423849520 is an abundant number, since it is smaller than the sum of its proper divisors (42936068400).

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

20423849520 is a wasteful number, since it uses less digits than its factorization.

20423849520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61822 (or 61816 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 20423849520 in words is "twenty billion, four hundred twenty-three million, eight hundred forty-nine thousand, five hundred twenty".