20421783994248 has 192 divisors, whose sum is σ = 69188559148800. Its totient is φ = 5297670397440.

The previous prime is 20421783994247. The next prime is 20421783994289. The reversal of 20421783994248 is 84249938712402.

It is a happy number.

20421783994248 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 178 + 39 + 9 + 424 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (20421783994247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25148508 + ... + 25947851.

It is an arithmetic number, because the mean of its divisors is an integer number (360357078900).

Almost surely, 2^{20421783994248} is an apocalyptic number.

20421783994248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20421783994248 is an abundant number, since it is smaller than the sum of its proper divisors (48766775154552).

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

20421783994248 is a wasteful number, since it uses less digits than its factorization.

20421783994248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51096452 (or 51096445 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 20421783994248 in words is "twenty trillion, four hundred twenty-one billion, seven hundred eighty-three million, nine hundred ninety-four thousand, two hundred forty-eight".