19915995 has 24 divisors (see below), whose sum is σ = 35029008. Its totient is φ = 9655360.

The previous prime is 19915991. The next prime is 19916003. The reversal of 19915995 is 59951991.

It is a happy number.

It is not a de Polignac number, because 19915995 - 2² = 19915991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19915991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3672 + ... + 7301.

It is an arithmetic number, because the mean of its divisors is an integer number (1459542).

Almost surely, 2^19915995 is an apocalyptic number.

19915995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19915995 is a deficient number, since it is larger than the sum of its proper divisors (15113013).

19915995 is a wasteful number, since it uses less digits than its factorization.

19915995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11003 (or 10992 counting only the distinct ones).

The product of its digits is 164025, while the sum is 48.

The square root of 19915995 is about 4462.7340274769. The cubic root of 19915995 is about 271.0611872387.

It can be divided in two parts, 19915 and 995, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 19915995 in words is "nineteen million, nine hundred fifteen thousand, nine hundred ninety-five".