19994669 has 16 divisors (see below), whose sum is σ = 22538880. Its totient is φ = 17625600.

The previous prime is 19994657. The next prime is 19994701. The reversal of 19994669 is 96649991.

It is not a de Polignac number, because 19994669 - 2⁸ = 19994413 is a prime.

It is a super-2 number, since 2×19994669² = 799573576839122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19994669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19993669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32969 + ... + 33569.

It is an arithmetic number, because the mean of its divisors is an integer number (1408680).

Almost surely, 2^19994669 is an apocalyptic number.

19994669 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19994669 is a deficient number, since it is larger than the sum of its proper divisors (2544211).

19994669 is a wasteful number, since it uses less digits than its factorization.

19994669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740.

The product of its digits is 944784, while the sum is 53.

The square root of 19994669 is about 4471.5398913573. The cubic root of 19994669 is about 271.4176419158.

The spelling of 19994669 in words is "nineteen million, nine hundred ninety-four thousand, six hundred sixty-nine".