20858199490 has 8 divisors (see below), whose sum is σ = 37544759100. Its totient is φ = 8343279792.

The previous prime is 20858199437. The next prime is 20858199539. The reversal of 20858199490 is 9499185802.

It can be written as a sum of positive squares in 2 ways, for example, as 19334624401 + 1523575089 = 139049^2 + 39033^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1042909965 + ... + 1042909984.

Almost surely, 2^20858199490 is an apocalyptic number.

20858199490 is a deficient number, since it is larger than the sum of its proper divisors (16686559610).

20858199490 is a wasteful number, since it uses less digits than its factorization.

20858199490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085819956.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 20858199490 in words is "twenty billion, eight hundred fifty-eight million, one hundred ninety-nine thousand, four hundred ninety".