20019999999 has 16 divisors (see below), whose sum is σ = 26817069312. Its totient is φ = 13284883968.

The previous prime is 20019999991. The next prime is 20020000073. The reversal of 20019999999 is 99999991002.

It is not a de Polignac number, because 20019999999 - 2³ = 20019999991 is a prime.

20019999999 is a modest number, since divided by 999999 gives 20019 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20019999991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002399 + ... + 1022175.

It is an arithmetic number, because the mean of its divisors is an integer number (1676066832).

Almost surely, 2^20019999999 is an apocalyptic number.

20019999999 is a deficient number, since it is larger than the sum of its proper divisors (6797069313).

20019999999 is a wasteful number, since it uses less digits than its factorization.

20019999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21326.

The product of its (nonzero) digits is 9565938, while the sum is 66.

The spelling of 20019999999 in words is "twenty billion, nineteen million, nine hundred ninety-nine thousand, nine hundred ninety-nine".