20201001858 has 48 divisors (see below), whose sum is σ = 45665302560. Its totient is φ = 6619475736.

The previous prime is 20201001857. The next prime is 20201001941. The reversal of 20201001858 is 85810010202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20201001857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134241 + ... + 241707.

It is an arithmetic number, because the mean of its divisors is an integer number (951360470).

Almost surely, 2^20201001858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20201001858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22832651280).

20201001858 is an abundant number, since it is smaller than the sum of its proper divisors (25464300702).

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

20201001858 is a wasteful number, since it uses less digits than its factorization.

20201001858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107596 (or 107531 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The spelling of 20201001858 in words is "twenty billion, two hundred one million, one thousand, eight hundred fifty-eight".