19444920 has 64 divisors (see below), whose sum is σ = 63642240. Its totient is φ = 4713600.

The previous prime is 19444883. The next prime is 19444933. The reversal of 19444920 is 2944491.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 15 ways as a sum of consecutive naturals, for example, 6046 + ... + 8685.

It is an arithmetic number, because the mean of its divisors is an integer number (994410).

Almost surely, 2^19444920 is an apocalyptic number.

19444920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19444920 is an abundant number, since it is smaller than the sum of its proper divisors (44197320).

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

19444920 is a wasteful number, since it uses less digits than its factorization.

19444920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14756 (or 14752 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 19444920 is about 4409.6394410428. The cubic root of 19444920 is about 268.9069665337.

The spelling of 19444920 in words is "nineteen million, four hundred forty-four thousand, nine hundred twenty".