19974540 has 48 divisors (see below), whose sum is σ = 57738240. Its totient is φ = 5154240.

The previous prime is 19974517. The next prime is 19974547. The reversal of 19974540 is 4547991.

It is not an unprimeable number, because it can be changed into a prime (19974547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3510 + ... + 7229.

It is an arithmetic number, because the mean of its divisors is an integer number (1202880).

Almost surely, 2^19974540 is an apocalyptic number.

19974540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19974540 is an abundant number, since it is smaller than the sum of its proper divisors (37763700).

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

19974540 is a wasteful number, since it uses less digits than its factorization.

19974540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10782 (or 10780 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 19974540 is about 4469.2885339839. The cubic root of 19974540 is about 271.3265309619.

The spelling of 19974540 in words is "nineteen million, nine hundred seventy-four thousand, five hundred forty".