20617982 has 32 divisors (see below), whose sum is σ = 40241664. Its totient is φ = 7682400.

The previous prime is 20617981. The next prime is 20617999. The reversal of 20617982 is 28971602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20617981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632 + ... + 6452.

It is an arithmetic number, because the mean of its divisors is an integer number (1257552).

Almost surely, 2^20617982 is an apocalyptic number.

20617982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20617982 is a deficient number, since it is larger than the sum of its proper divisors (19623682).

20617982 is a wasteful number, since it uses less digits than its factorization.

20617982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5864.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20617982 is about 4540.7028090374. The cubic root of 20617982 is about 274.2092191456.

The spelling of 20617982 in words is "twenty million, six hundred seventeen thousand, nine hundred eighty-two".