20845231 has 8 divisors (see below), whose sum is σ = 23126400. Its totient is φ = 18628440.

The previous prime is 20845219. The next prime is 20845267. The reversal of 20845231 is 13254802.

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 20845231 - 2¹³ = 20837039 is a prime.

It is a super-2 number, since 2×20845231² = 869047310886722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20845196 and 20845205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20845631) 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, 15411 + ... + 16708.

It is an arithmetic number, because the mean of its divisors is an integer number (2890800).

Almost surely, 2^20845231 is an apocalyptic number.

20845231 is a deficient number, since it is larger than the sum of its proper divisors (2281169).

20845231 is a wasteful number, since it uses less digits than its factorization.

20845231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32189.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20845231 is about 4565.6577839343. The cubic root of 20845231 is about 275.2129744128.

The spelling of 20845231 in words is "twenty million, eight hundred forty-five thousand, two hundred thirty-one".