20947008 has 56 divisors (see below), whose sum is σ = 56164480. Its totient is φ = 6888960.

The previous prime is 20947001. The next prime is 20947021. The reversal of 20947008 is 80074902.

It is not an unprimeable number, because it can be changed into a prime (20947001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14478 + ... + 15858.

Almost surely, 2^20947008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20947008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28082240).

20947008 is an abundant number, since it is smaller than the sum of its proper divisors (35217472).

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

20947008 is a wasteful number, since it uses less digits than its factorization.

20947008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20947008 is about 4576.7901415730. The cubic root of 20947008 is about 275.6601572278.

The spelling of 20947008 in words is "twenty million, nine hundred forty-seven thousand, eight".