19916740 has 24 divisors (see below), whose sum is σ = 42799680. Its totient is φ = 7781088.

The previous prime is 19916737. The next prime is 19916761. The reversal of 19916740 is 4761991.

It is a self number, because there is not a number n which added to its sum of digits gives 19916740.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10720 + ... + 12439.

It is an arithmetic number, because the mean of its divisors is an integer number (1783320).

Almost surely, 2^19916740 is an apocalyptic number.

19916740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19916740 is an abundant number, since it is smaller than the sum of its proper divisors (22882940).

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

19916740 is a wasteful number, since it uses less digits than its factorization.

19916740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23211 (or 23209 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 19916740 is about 4462.8174957083. The cubic root of 19916740 is about 271.0645670693.

The spelling of 19916740 in words is "nineteen million, nine hundred sixteen thousand, seven hundred forty".