19669090 has 48 divisors (see below), whose sum is σ = 41626872. Its totient is φ = 6671616.

The previous prime is 19669087. The next prime is 19669121. The reversal of 19669090 is 9096691.

It can be written as a sum of positive squares in 4 ways, for example, as 19263321 + 405769 = 4389^2 + 637^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66984 + ... + 67276.

Almost surely, 2^19669090 is an apocalyptic number.

19669090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19669090 is an abundant number, since it is smaller than the sum of its proper divisors (21957782).

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

19669090 is a wasteful number, since it uses less digits than its factorization.

19669090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 19669090 is about 4434.9847801317. The cubic root of 19669090 is about 269.9363819020.

The spelling of 19669090 in words is "nineteen million, six hundred sixty-nine thousand, ninety".