17990020800 has 504 divisors, whose sum is σ = 68787264000. Its totient is φ = 4444968960.

The previous prime is 17990020771. The next prime is 17990020849. The reversal of 17990020800 is 802009971.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12858501 + ... + 12859899.

Almost surely, 2^17990020800 is an apocalyptic number.

17990020800 is a gapful number since it is divisible by the number (10) 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 17990020800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34393632000).

17990020800 is an abundant number, since it is smaller than the sum of its proper divisors (50797243200).

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

17990020800 is a wasteful number, since it uses less digits than its factorization.

17990020800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 17990020800 in words is "seventeen billion, nine hundred ninety million, twenty thousand, eight hundred".