19946840 has 32 divisors (see below), whose sum is σ = 45928080. Its totient is φ = 7792512.

The previous prime is 19946837. The next prime is 19946863. The reversal of 19946840 is 4864991.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4079 + ... + 7518.

Almost surely, 2^19946840 is an apocalyptic number.

19946840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19946840 is an abundant number, since it is smaller than the sum of its proper divisors (25981240).

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

19946840 is a wasteful number, since it uses less digits than its factorization.

19946840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11651 (or 11647 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 19946840 is about 4466.1885316229. The cubic root of 19946840 is about 271.2010508628.

The spelling of 19946840 in words is "nineteen million, nine hundred forty-six thousand, eight hundred forty".