20240891 has 8 divisors (see below), whose sum is σ = 22171968. Its totient is φ = 18325000.

The previous prime is 20240873. The next prime is 20240903. The reversal of 20240891 is 19804202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20240891 - 2¹⁴ = 20224507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20240891.

It is not an unprimeable number, because it can be changed into a prime (20240821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 905 + ... + 6426.

It is an arithmetic number, because the mean of its divisors is an integer number (2771496).

Almost surely, 2^20240891 is an apocalyptic number.

20240891 is a deficient number, since it is larger than the sum of its proper divisors (1931077).

20240891 is a wasteful number, since it uses less digits than its factorization.

20240891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7593.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20240891 is about 4498.9877750445. The cubic root of 20240891 is about 272.5272132854.

The spelling of 20240891 in words is "twenty million, two hundred forty thousand, eight hundred ninety-one".