19995481 has 4 divisors (see below), whose sum is σ = 21813264. Its totient is φ = 18177700.

The previous prime is 19995461. The next prime is 19995491. The reversal of 19995481 is 18459991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18459991 = 11 ⋅1678181.

It is a cyclic number.

It is not a de Polignac number, because 19995481 - 2¹⁵ = 19962713 is a prime.

It is a super-2 number, since 2×19995481² = 799638520842722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19995401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908875 + ... + 908896.

It is an arithmetic number, because the mean of its divisors is an integer number (5453316).

Almost surely, 2^19995481 is an apocalyptic number.

19995481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19995481 is a deficient number, since it is larger than the sum of its proper divisors (1817783).

19995481 is a wasteful number, since it uses less digits than its factorization.

19995481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817782.

The product of its digits is 116640, while the sum is 46.

The square root of 19995481 is about 4471.6306868971. The cubic root of 19995481 is about 271.4213160308.

The spelling of 19995481 in words is "nineteen million, nine hundred ninety-five thousand, four hundred eighty-one".