20947658 has 8 divisors (see below), whose sum is σ = 31571040. Its totient is φ = 10423980.

The previous prime is 20947649. The next prime is 20947669. The reversal of 20947658 is 85674902.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24398 + ... + 25241.

It is an arithmetic number, because the mean of its divisors is an integer number (3946380).

Almost surely, 2^20947658 is an apocalyptic number.

20947658 is a deficient number, since it is larger than the sum of its proper divisors (10623382).

20947658 is a wasteful number, since it uses less digits than its factorization.

20947658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49852.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20947658 is about 4576.8611514880. The cubic root of 20947658 is about 275.6630085061.

The spelling of 20947658 in words is "twenty million, nine hundred forty-seven thousand, six hundred fifty-eight".