20994819620544 has 896 divisors, whose sum is σ = 81580421283840. Its totient is φ = 5134623436800.

The previous prime is 20994819620543. The next prime is 20994819620563. The reversal of 20994819620544 is 44502691849902.

20994819620544 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 4 + 81 + 9 + 6 + 2 + 0 + 544 = 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 (20994819620543) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 152546449 + ... + 152684015.

Almost surely, 2^{20994819620544} is an apocalyptic number.

20994819620544 is a gapful number since it is divisible by the number (24) 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 20994819620544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40790210641920).

20994819620544 is an abundant number, since it is smaller than the sum of its proper divisors (60585601663296).

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

20994819620544 is a wasteful number, since it uses less digits than its factorization.

20994819620544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137674 (or 137658 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 20994819620544 in words is "twenty trillion, nine hundred ninety-four billion, eight hundred nineteen million, six hundred twenty thousand, five hundred forty-four".