20021453254400 has 324 divisors, whose sum is σ = 56485820691720. Its totient is φ = 7003448524800.

The previous prime is 20021453254379. The next prime is 20021453254433. The reversal of 20021453254400 is 445235412002.

It is a super-2 number, since 2×20021453254400² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20063270 + ... + 21037530.

Almost surely, 2^{20021453254400} is an apocalyptic number.

20021453254400 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 20021453254400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28242910345860).

20021453254400 is an abundant number, since it is smaller than the sum of its proper divisors (36464367437320).

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

20021453254400 is a wasteful number, since it uses less digits than its factorization.

20021453254400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974332 (or 974300 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 20021453254400 its reverse (445235412002), we get a palindrome (20466688666402).

The spelling of 20021453254400 in words is "twenty trillion, twenty-one billion, four hundred fifty-three million, two hundred fifty-four thousand, four hundred".