19776312906 has 32 divisors (see below), whose sum is σ = 47582108160. Its totient is φ = 5352986736.

The previous prime is 19776312739. The next prime is 19776312917. The reversal of 19776312906 is 60921367791.

19776312906 = 10669² + 10670² + ... + 10839².

It is a super-2 number, since 2×19776312906² (a number of 21 digits) contains 22 as substring.

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, 12390376 + ... + 12391971.

It is an arithmetic number, because the mean of its divisors is an integer number (1486940880).

Almost surely, 2^19776312906 is an apocalyptic number.

19776312906 is an abundant number, since it is smaller than the sum of its proper divisors (27805795254).

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

19776312906 is a wasteful number, since it uses less digits than its factorization.

19776312906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24782378.

The product of its (nonzero) digits is 857304, while the sum is 51.

The spelling of 19776312906 in words is "nineteen billion, seven hundred seventy-six million, three hundred twelve thousand, nine hundred six".