19669940 has 48 divisors (see below), whose sum is σ = 44688000. Its totient is φ = 7247232.

The previous prime is 19669931. The next prime is 19669957. The reversal of 19669940 is 4996691.

It is a junction number, because it is equal to n+sod(n) for n = 19669891 and 19669900.

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, 13361 + ... + 14759.

It is an arithmetic number, because the mean of its divisors is an integer number (931000).

Almost surely, 2^19669940 is an apocalyptic number.

19669940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19669940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22344000).

19669940 is an abundant number, since it is smaller than the sum of its proper divisors (25018060).

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

19669940 is a wasteful number, since it uses less digits than its factorization.

19669940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1462 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 19669940 is about 4435.0806080611. The cubic root of 19669940 is about 269.9402702809.

The spelling of 19669940 in words is "nineteen million, six hundred sixty-nine thousand, nine hundred forty".