19941840 has 60 divisors (see below), whose sum is σ = 66973764. Its totient is φ = 5317632.

The previous prime is 19941839. The next prime is 19941863. The reversal of 19941840 is 4814991.

It can be written as a sum of positive squares in 2 ways, for example, as 2702736 + 17239104 = 1644^2 + 4152^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19941795 and 19941804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13129 + ... + 14568.

Almost surely, 2^19941840 is an apocalyptic number.

19941840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19941840 is an abundant number, since it is smaller than the sum of its proper divisors (47031924).

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

19941840 is a wasteful number, since it uses less digits than its factorization.

19941840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27716 (or 27707 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 19941840 is about 4465.6287351279. The cubic root of 19941840 is about 271.1783886504.

The spelling of 19941840 in words is "nineteen million, nine hundred forty-one thousand, eight hundred forty".