20233691 has 2 divisors, whose sum is σ = 20233692. Its totient is φ = 20233690.

The previous prime is 20233687. The next prime is 20233739. The reversal of 20233691 is 19633202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20233691 - 2² = 20233687 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20233691.

It is not a weakly prime, because it can be changed into another prime (20233601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10116845 + 10116846.

It is an arithmetic number, because the mean of its divisors is an integer number (10116846).

Almost surely, 2^20233691 is an apocalyptic number.

20233691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20233691 is an equidigital number, since it uses as much as digits as its factorization.

20233691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20233691 is about 4498.1875238811. The cubic root of 20233691 is about 272.4948953958.

Adding to 20233691 its reverse (19633202), we get a palindrome (39866893).

The spelling of 20233691 in words is "twenty million, two hundred thirty-three thousand, six hundred ninety-one".