20170455040 has 96 divisors (see below), whose sum is σ = 49959262080. Its totient is φ = 7807795200.

The previous prime is 20170455029. The next prime is 20170455047. The reversal of 20170455040 is 4055407102.

It is a super-2 number, since 2×20170455040² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20170455047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285670 + ... + 349210.

It is an arithmetic number, because the mean of its divisors is an integer number (520408980).

Almost surely, 2^20170455040 is an apocalyptic number.

20170455040 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 20170455040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24979631040).

20170455040 is an abundant number, since it is smaller than the sum of its proper divisors (29788807040).

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

20170455040 is an equidigital number, since it uses as much as digits as its factorization.

20170455040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63599 (or 63579 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The spelling of 20170455040 in words is "twenty billion, one hundred seventy million, four hundred fifty-five thousand, forty".