20197668 has 24 divisors (see below), whose sum is σ = 47262880. Its totient is φ = 6713280.

The previous prime is 20197637. The next prime is 20197669. The reversal of 20197668 is 86679102.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20197669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2328 + ... + 6768.

Almost surely, 2^20197668 is an apocalyptic number.

It is an amenable number.

20197668 is an abundant number, since it is smaller than the sum of its proper divisors (27065212).

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

20197668 is a wasteful number, since it uses less digits than its factorization.

20197668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4827 (or 4825 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20197668 is about 4494.1815717659. The cubic root of 20197668 is about 272.3330874697. Note that the first 3 decimals are identical.

The spelling of 20197668 in words is "twenty million, one hundred ninety-seven thousand, six hundred sixty-eight".