20424991800 has 96 divisors (see below), whose sum is σ = 64119110400. Its totient is φ = 5377706880.

The previous prime is 20424991757. The next prime is 20424991813. The reversal of 20424991800 is 819942402.

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, 168054 + ... + 262853.

It is an arithmetic number, because the mean of its divisors is an integer number (667907400).

Almost surely, 2^20424991800 is an apocalyptic number.

20424991800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20424991800 is an abundant number, since it is smaller than the sum of its proper divisors (43694118600).

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

20424991800 is a wasteful number, since it uses less digits than its factorization.

20424991800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431005 (or 430996 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 20424991800 in words is "twenty billion, four hundred twenty-four million, nine hundred ninety-one thousand, eight hundred".