20863245 has 32 divisors (see below), whose sum is σ = 36352512. Its totient is φ = 10156032.

The previous prime is 20863229. The next prime is 20863247. The reversal of 20863245 is 54236802.

It is not a de Polignac number, because 20863245 - 2⁴ = 20863229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20863247) 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 31 ways as a sum of consecutive naturals, for example, 18364 + ... + 19466.

It is an arithmetic number, because the mean of its divisors is an integer number (1136016).

Almost surely, 2^20863245 is an apocalyptic number.

It is an amenable number.

20863245 is a deficient number, since it is larger than the sum of its proper divisors (15489267).

20863245 is a wasteful number, since it uses less digits than its factorization.

20863245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20863245 is about 4567.6301295092. The cubic root of 20863245 is about 275.2922292969.

The spelling of 20863245 in words is "twenty million, eight hundred sixty-three thousand, two hundred forty-five".