20445021200 has 120 divisors (see below), whose sum is σ = 49564536000. Its totient is φ = 8104250880.

The previous prime is 20445021161. The next prime is 20445021221. The reversal of 20445021200 is 212054402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 33352094 + ... + 33352706.

It is an arithmetic number, because the mean of its divisors is an integer number (413037800).

Almost surely, 2^20445021200 is an apocalyptic number.

20445021200 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 20445021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24782268000).

20445021200 is an abundant number, since it is smaller than the sum of its proper divisors (29119514800).

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

20445021200 is a wasteful number, since it uses less digits than its factorization.

20445021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 20445021200 its reverse (212054402), we get a palindrome (20657075602).

The spelling of 20445021200 in words is "twenty billion, four hundred forty-five million, twenty-one thousand, two hundred".