20731982 has 8 divisors (see below), whose sum is σ = 31759776. Its totient is φ = 10145392.

The previous prime is 20731979. The next prime is 20731987. The reversal of 20731982 is 28913702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110183 + ... + 110370.

It is an arithmetic number, because the mean of its divisors is an integer number (3969972).

Almost surely, 2^20731982 is an apocalyptic number.

20731982 is a deficient number, since it is larger than the sum of its proper divisors (11027794).

20731982 is a wasteful number, since it uses less digits than its factorization.

20731982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220602.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20731982 is about 4553.2386276144. The cubic root of 20731982 is about 274.7136722292.

The spelling of 20731982 in words is "twenty million, seven hundred thirty-one thousand, nine hundred eighty-two".