20451814500 has 192 divisors, whose sum is σ = 64576512000. Its totient is φ = 4999795200.

The previous prime is 20451814489. The next prime is 20451814547. The reversal of 20451814500 is 541815402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2901981 + ... + 2909019.

It is an arithmetic number, because the mean of its divisors is an integer number (336336000).

Almost surely, 2^20451814500 is an apocalyptic number.

20451814500 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 20451814500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32288256000).

20451814500 is an abundant number, since it is smaller than the sum of its proper divisors (44124697500).

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

20451814500 is a wasteful number, since it uses less digits than its factorization.

20451814500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7223 (or 7211 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The spelling of 20451814500 in words is "twenty billion, four hundred fifty-one million, eight hundred fourteen thousand, five hundred".