20243320400 has 120 divisors (see below), whose sum is σ = 49050116544. Its totient is φ = 8028518400.

The previous prime is 20243320387. The next prime is 20243320411. The reversal of 20243320400 is 402334202.

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

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, 35452115 + ... + 35452685.

Almost surely, 2^20243320400 is an apocalyptic number.

20243320400 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 20243320400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24525058272).

20243320400 is an abundant number, since it is smaller than the sum of its proper divisors (28806796144).

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

20243320400 is a wasteful number, since it uses less digits than its factorization.

20243320400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

Adding to 20243320400 its reverse (402334202), we get a palindrome (20645654602).

The spelling of 20243320400 in words is "twenty billion, two hundred forty-three million, three hundred twenty thousand, four hundred".