19999995 has 32 divisors (see below), whose sum is σ = 34560000. Its totient is φ = 9846144.

The previous prime is 19999981. The next prime is 19999999. The reversal of 19999995 is 59999991.

It is not a de Polignac number, because 19999995 - 2⁵ = 19999963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19999999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9006 + ... + 11004.

It is an arithmetic number, because the mean of its divisors is an integer number (1080000).

Almost surely, 2^19999995 is an apocalyptic number.

19999995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19999995 is a deficient number, since it is larger than the sum of its proper divisors (14560005).

19999995 is a wasteful number, since it uses less digits than its factorization.

19999995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059.

The product of its digits is 2657205, while the sum is 60.

The square root of 19999995 is about 4472.1353959826. The cubic root of 19999995 is about 271.4417390393.

The spelling of 19999995 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred ninety-five".