19944890 has 16 divisors (see below), whose sum is σ = 41029632. Its totient is φ = 6838224.

The previous prime is 19944877. The next prime is 19944913. The reversal of 19944890 is 9844991.

It is a super-2 number, since 2×19944890² = 795597274224200, which contains 22 as substring.

It is a Curzon number.

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, 142394 + ... + 142533.

It is an arithmetic number, because the mean of its divisors is an integer number (2564352).

Almost surely, 2^19944890 is an apocalyptic number.

19944890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19944890 is an abundant number, since it is smaller than the sum of its proper divisors (21084742).

19944890 is a wasteful number, since it uses less digits than its factorization.

19944890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284941.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 19944890 is about 4465.9702193364. The cubic root of 19944890 is about 271.1922130505.

The spelling of 19944890 in words is "nineteen million, nine hundred forty-four thousand, eight hundred ninety".