20982658 has 32 divisors (see below), whose sum is σ = 34604928. Its totient is φ = 9504000.

The previous prime is 20982653. The next prime is 20982659. The reversal of 20982658 is 85628902.

It is a self number, because there is not a number n which added to its sum of digits gives 20982658.

It is not an unprimeable number, because it can be changed into a prime (20982653) 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, 138883 + ... + 139033.

It is an arithmetic number, because the mean of its divisors is an integer number (1081404).

Almost surely, 2^20982658 is an apocalyptic number.

20982658 is a deficient number, since it is larger than the sum of its proper divisors (13622270).

20982658 is a wasteful number, since it uses less digits than its factorization.

20982658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 20982658 is about 4580.6831368258. The cubic root of 20982658 is about 275.8164518612.

The spelling of 20982658 in words is "twenty million, nine hundred eighty-two thousand, six hundred fifty-eight".