19945481 has 8 divisors (see below), whose sum is σ = 20532960. Its totient is φ = 19366432.

The previous prime is 19945469. The next prime is 19945487. The reversal of 19945481 is 18454991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19945481 is a prime.

It is a super-2 number, since 2×19945481² = 795644424642722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19945487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2861 + ... + 6933.

It is an arithmetic number, because the mean of its divisors is an integer number (2566620).

Almost surely, 2^19945481 is an apocalyptic number.

It is an amenable number.

19945481 is a deficient number, since it is larger than the sum of its proper divisors (587479).

19945481 is an equidigital number, since it uses as much as digits as its factorization.

19945481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4215.

The product of its digits is 51840, while the sum is 41.

The square root of 19945481 is about 4466.0363858795. The cubic root of 19945481 is about 271.1948916483.

The spelling of 19945481 in words is "nineteen million, nine hundred forty-five thousand, four hundred eighty-one".