20197686 has 32 divisors (see below), whose sum is σ = 41909760. Its totient is φ = 6484896.

The previous prime is 20197669. The next prime is 20197687. The reversal of 20197686 is 68679102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197687) by changing a digit.

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, 18360 + ... + 19428.

It is an arithmetic number, because the mean of its divisors is an integer number (1309680).

Almost surely, 2^20197686 is an apocalyptic number.

20197686 is an abundant number, since it is smaller than the sum of its proper divisors (21712074).

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

20197686 is a wasteful number, since it uses less digits than its factorization.

20197686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188.

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

The square root of 20197686 is about 4494.1835743547. The cubic root of 20197686 is about 272.3331683700. Note that the first 3 decimals are identical.

The spelling of 20197686 in words is "twenty million, one hundred ninety-seven thousand, six hundred eighty-six".