20021243200 has 252 divisors, whose sum is σ = 57585144672. Its totient is φ = 6831283200.

The previous prime is 20021243183. The next prime is 20021243227. The reversal of 20021243200 is 234212002.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20618715 + ... + 20619685.

Almost surely, 2^20021243200 is an apocalyptic number.

20021243200 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 20021243200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28792572336).

20021243200 is an abundant number, since it is smaller than the sum of its proper divisors (37563901472).

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

20021243200 is a wasteful number, since it uses less digits than its factorization.

20021243200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20021243200 its reverse (234212002), we get a palindrome (20255455202).

The spelling of 20021243200 in words is "twenty billion, twenty-one million, two hundred forty-three thousand, two hundred".