19945480 has 32 divisors (see below), whose sum is σ = 45330840. Its totient is φ = 7897600.

The previous prime is 19945469. The next prime is 19945487. The reversal of 19945480 is 8454991.

It can be written as a sum of positive squares in 4 ways, for example, as 19131876 + 813604 = 4374^2 + 902^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1572 + ... + 6508.

Almost surely, 2^19945480 is an apocalyptic number.

19945480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19945480 is an abundant number, since it is smaller than the sum of its proper divisors (25385360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19945480 is a wasteful number, since it uses less digits than its factorization.

19945480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049 (or 5045 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 19945480 is about 4466.0362739234. The cubic root of 19945480 is about 271.1948871160.

The spelling of 19945480 in words is "nineteen million, nine hundred forty-five thousand, four hundred eighty".