20858190198 has 16 divisors (see below), whose sum is σ = 41723397120. Its totient is φ = 6951560616.

The previous prime is 20858190181. The next prime is 20858190211. The reversal of 20858190198 is 89109185802.

It is a self number, because there is not a number n which added to its sum of digits gives 20858190198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253318 + ... + 325401.

It is an arithmetic number, because the mean of its divisors is an integer number (2607712320).

Almost surely, 2^20858190198 is an apocalyptic number.

20858190198 is an abundant number, since it is smaller than the sum of its proper divisors (20865206922).

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

20858190198 is a wasteful number, since it uses less digits than its factorization.

20858190198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584731.

The product of its (nonzero) digits is 414720, while the sum is 51.

The spelling of 20858190198 in words is "twenty billion, eight hundred fifty-eight million, one hundred ninety thousand, one hundred ninety-eight".