20947486 has 16 divisors (see below), whose sum is σ = 36005760. Its totient is φ = 8953560.

The previous prime is 20947471. The next prime is 20947499. The reversal of 20947486 is 68474902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4081 + ... + 7651.

It is an arithmetic number, because the mean of its divisors is an integer number (2250360).

Almost surely, 2^20947486 is an apocalyptic number.

20947486 is a deficient number, since it is larger than the sum of its proper divisors (15058274).

20947486 is a wasteful number, since it uses less digits than its factorization.

20947486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 20947486 is about 4576.8423612792. The cubic root of 20947486 is about 275.6622540197.

The spelling of 20947486 in words is "twenty million, nine hundred forty-seven thousand, four hundred eighty-six".