20798658 has 24 divisors (see below), whose sum is σ = 45147648. Its totient is φ = 6919992.

The previous prime is 20798653. The next prime is 20798671. The reversal of 20798658 is 85689702.

It is not an unprimeable number, because it can be changed into a prime (20798653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18591 + ... + 19677.

It is an arithmetic number, because the mean of its divisors is an integer number (1881152).

Almost surely, 2^20798658 is an apocalyptic number.

20798658 is an abundant number, since it is smaller than the sum of its proper divisors (24348990).

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

20798658 is a wasteful number, since it uses less digits than its factorization.

20798658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158 (or 2155 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20798658 is about 4560.5545715406. The cubic root of 20798658 is about 275.0078587286.

The spelling of 20798658 in words is "twenty million, seven hundred ninety-eight thousand, six hundred fifty-eight".