20100145170 has 64 divisors (see below), whose sum is σ = 55157034240. Its totient is φ = 4592218368.

The previous prime is 20100145157. The next prime is 20100145171. The reversal of 20100145170 is 7154100102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20100145171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 464164 + ... + 505616.

It is an arithmetic number, because the mean of its divisors is an integer number (861828660).

Almost surely, 2^20100145170 is an apocalyptic number.

20100145170 is an abundant number, since it is smaller than the sum of its proper divisors (35056889070).

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

20100145170 is a wasteful number, since it uses less digits than its factorization.

20100145170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43779.

The product of its (nonzero) digits is 280, while the sum is 21.

Adding to 20100145170 its reverse (7154100102), we get a palindrome (27254245272).

The spelling of 20100145170 in words is "twenty billion, one hundred million, one hundred forty-five thousand, one hundred seventy".