20927291 has 16 divisors (see below), whose sum is σ = 26258688. Its totient is φ = 16202400.

The previous prime is 20927287. The next prime is 20927293. The reversal of 20927291 is 19272902.

It is a cyclic number.

It is not a de Polignac number, because 20927291 - 2² = 20927287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20927293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12536 + ... + 14106.

It is an arithmetic number, because the mean of its divisors is an integer number (1641168).

Almost surely, 2^20927291 is an apocalyptic number.

20927291 is a deficient number, since it is larger than the sum of its proper divisors (5331397).

20927291 is a wasteful number, since it uses less digits than its factorization.

20927291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20927291 is about 4574.6356139041. The cubic root of 20927291 is about 275.5736389439.

The spelling of 20927291 in words is "twenty million, nine hundred twenty-seven thousand, two hundred ninety-one".