20993549220 has 720 divisors, whose sum is σ = 83092407552. Its totient is φ = 4406814720.

The previous prime is 20993549219. The next prime is 20993549281. The reversal of 20993549220 is 2294539902.

20993549220 is a `hidden beast` number, since 20 + 99 + 35 + 492 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 63424455 + ... + 63424785.

Almost surely, 2^20993549220 is an apocalyptic number.

20993549220 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 20993549220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41546203776).

20993549220 is an abundant number, since it is smaller than the sum of its proper divisors (62098858332).

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

20993549220 is a wasteful number, since it uses less digits than its factorization.

20993549220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 20993549220 in words is "twenty billion, nine hundred ninety-three million, five hundred forty-nine thousand, two hundred twenty".