19662994 has 16 divisors (see below), whose sum is σ = 31972248. Its totient is φ = 9015552.

The previous prime is 19662961. The next prime is 19663003. The reversal of 19662994 is 49926691.

It can be written as a sum of positive squares in 4 ways, for example, as 6953769 + 12709225 = 2637^2 + 3565^2 .

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, 1674 + ... + 6490.

Almost surely, 2^19662994 is an apocalyptic number.

19662994 is a deficient number, since it is larger than the sum of its proper divisors (12309254).

19662994 is a wasteful number, since it uses less digits than its factorization.

19662994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989.

The product of its digits is 209952, while the sum is 46.

The square root of 19662994 is about 4434.2974640861. The cubic root of 19662994 is about 269.9084920808.

It can be divided in two parts, 196 and 62994, that added together give a triangular number (63190 = T₃₅₅).

The spelling of 19662994 in words is "nineteen million, six hundred sixty-two thousand, nine hundred ninety-four".