20261985186 has 16 divisors (see below), whose sum is σ = 40525588224. Its totient is φ = 6753725424.

The previous prime is 20261985173. The next prime is 20261985199. The reversal of 20261985186 is 68158916202.

It is an interprime number because it is at equal distance from previous prime (20261985173) and next prime (20261985199).

It is a Curzon 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, 148696 + ... + 250268.

It is an arithmetic number, because the mean of its divisors is an integer number (2532849264).

Almost surely, 2^20261985186 is an apocalyptic number.

20261985186 is an abundant number, since it is smaller than the sum of its proper divisors (20263603038).

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

20261985186 is a wasteful number, since it uses less digits than its factorization.

20261985186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134825.

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 20261985186 in words is "twenty billion, two hundred sixty-one million, nine hundred eighty-five thousand, one hundred eighty-six".