20413721600 has 132 divisors (see below), whose sum is σ = 53265805800. Its totient is φ = 7735541760.

The previous prime is 20413721597. The next prime is 20413721623. The reversal of 20413721600 is 612731402.

It is a self number, because there is not a number n which added to its sum of digits gives 20413721600.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 465416 + ... + 507384.

Almost surely, 2^20413721600 is an apocalyptic number.

20413721600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20413721600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26632902900).

20413721600 is an abundant number, since it is smaller than the sum of its proper divisors (32852084200).

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

20413721600 is a wasteful number, since it uses less digits than its factorization.

20413721600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42018 (or 41995 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The spelling of 20413721600 in words is "twenty billion, four hundred thirteen million, seven hundred twenty-one thousand, six hundred".