20865042 has 24 divisors (see below), whose sum is σ = 49317840. Its totient is φ = 6322680.

The previous prime is 20865041. The next prime is 20865067. The reversal of 20865042 is 24056802.

20865042 is a `hidden beast` number, since 2 + 0 + 8 + 650 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20864997 and 20865015.

It is not an unprimeable number, because it can be changed into a prime (20865041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52492 + ... + 52887.

It is an arithmetic number, because the mean of its divisors is an integer number (2054910).

Almost surely, 2^20865042 is an apocalyptic number.

20865042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20865042 is an abundant number, since it is smaller than the sum of its proper divisors (28452798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20865042 is a wasteful number, since it uses less digits than its factorization.

20865042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105398 (or 105395 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20865042 is about 4567.8268355970. The cubic root of 20865042 is about 275.3001329241.

The spelling of 20865042 in words is "twenty million, eight hundred sixty-five thousand, forty-two".