20099481858 has 32 divisors (see below), whose sum is σ = 44683344000. Its totient is φ = 6697153008.

The previous prime is 20099481839. The next prime is 20099481881. The reversal of 20099481858 is 85818499002.

20099481858 is a `hidden beast` number, since 20 + 0 + 99 + 481 + 8 + 58 = 666.

It is a super-2 number, since 2×20099481858² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64635 + ... + 210657.

It is an arithmetic number, because the mean of its divisors is an integer number (1396354500).

Almost surely, 2^20099481858 is an apocalyptic number.

20099481858 is an abundant number, since it is smaller than the sum of its proper divisors (24583862142).

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

20099481858 is a wasteful number, since it uses less digits than its factorization.

20099481858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148583 (or 148577 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 20099481858 in words is "twenty billion, ninety-nine million, four hundred eighty-one thousand, eight hundred fifty-eight".