20913658 has 8 divisors (see below), whose sum is σ = 32218452. Its totient is φ = 10174176.

The previous prime is 20913643. The next prime is 20913707. The reversal of 20913658 is 85631902.

It can be written as a sum of positive squares in 2 ways, for example, as 20857489 + 56169 = 4567^2 + 237^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141235 + ... + 141382.

Almost surely, 2^20913658 is an apocalyptic number.

20913658 is a deficient number, since it is larger than the sum of its proper divisors (11304794).

20913658 is a wasteful number, since it uses less digits than its factorization.

20913658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282656.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20913658 is about 4573.1453071163. The cubic root of 20913658 is about 275.5137854967.

The spelling of 20913658 in words is "twenty million, nine hundred thirteen thousand, six hundred fifty-eight".