20893689407 has 4 divisors (see below), whose sum is σ = 20909531280. Its totient is φ = 20877847536.

The previous prime is 20893689373. The next prime is 20893689413. The reversal of 20893689407 is 70498639802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20893689407 - 2⁸ = 20893689151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20893689497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7918958 + ... + 7921595.

It is an arithmetic number, because the mean of its divisors is an integer number (5227382820).

Almost surely, 2^20893689407 is an apocalyptic number.

20893689407 is a deficient number, since it is larger than the sum of its proper divisors (15841873).

20893689407 is a wasteful number, since it uses less digits than its factorization.

20893689407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15841872.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 20893689407 in words is "twenty billion, eight hundred ninety-three million, six hundred eighty-nine thousand, four hundred seven".