19969668 has 36 divisors (see below), whose sum is σ = 50859900. Its totient is φ = 6606336.

The previous prime is 19969667. The next prime is 19969669. The reversal of 19969668 is 86696991.

It is an interprime number because it is at equal distance from previous prime (19969667) and next prime (19969669).

It can be written as a sum of positive squares in 2 ways, for example, as 8191044 + 11778624 = 2862^2 + 3432^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (19969667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2908 + ... + 6956.

It is an arithmetic number, because the mean of its divisors is an integer number (1412775).

Almost surely, 2^19969668 is an apocalyptic number.

19969668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19969668 is an abundant number, since it is smaller than the sum of its proper divisors (30890232).

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

19969668 is a wasteful number, since it uses less digits than its factorization.

19969668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196 (or 4191 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 19969668 is about 4468.7434475476. The cubic root of 19969668 is about 271.3044693717.

It can be divided in two parts, 1996 and 9668, that added together give a square (11664 = 108²).

The spelling of 19969668 in words is "nineteen million, nine hundred sixty-nine thousand, six hundred sixty-eight".