20293691 has 16 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 17265600.

The previous prime is 20293687. The next prime is 20293703. The reversal of 20293691 is 19639202.

It is not a de Polignac number, because 20293691 - 2² = 20293687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20293391) 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 15 ways as a sum of consecutive naturals, for example, 18056 + ... + 19146.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^20293691 is an apocalyptic number.

20293691 is a deficient number, since it is larger than the sum of its proper divisors (3293509).

20293691 is a wasteful number, since it uses less digits than its factorization.

20293691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 20293691 is about 4504.8519398533. The cubic root of 20293691 is about 272.7639772855.

The spelling of 20293691 in words is "twenty million, two hundred ninety-three thousand, six hundred ninety-one".