20197984 has 12 divisors (see below), whose sum is σ = 39764844. Its totient is φ = 10098976.

The previous prime is 20197981. The next prime is 20197987. The reversal of 20197984 is 48979102.

It is an interprime number because it is at equal distance from previous prime (20197981) and next prime (20197987).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315562 + ... + 315625.

It is an arithmetic number, because the mean of its divisors is an integer number (3313737).

Almost surely, 2^20197984 is an apocalyptic number.

It is an amenable number.

20197984 is a deficient number, since it is larger than the sum of its proper divisors (19566860).

20197984 is an equidigital number, since it uses as much as digits as its factorization.

20197984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631197 (or 631189 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 20197984 is about 4494.2167281964. The cubic root of 20197984 is about 272.3345077130.

The spelling of 20197984 in words is "twenty million, one hundred ninety-seven thousand, nine hundred eighty-four".