20947746 has 8 divisors (see below), whose sum is σ = 41895504. Its totient is φ = 6982580.

The previous prime is 20947741. The next prime is 20947781. The reversal of 20947746 is 64774902.

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

20947746 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20947741) 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 3 ways as a sum of consecutive naturals, for example, 1745640 + ... + 1745651.

It is an arithmetic number, because the mean of its divisors is an integer number (5236938).

Almost surely, 2^20947746 is an apocalyptic number.

20947746 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20947746 is a wasteful number, since it uses less digits than its factorization.

20947746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491296.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 20947746 is about 4576.8707650533. The cubic root of 20947746 is about 275.6633945208.

The spelling of 20947746 in words is "twenty million, nine hundred forty-seven thousand, seven hundred forty-six".