20861315 has 8 divisors (see below), whose sum is σ = 25161840. Its totient is φ = 16603552.

The previous prime is 20861287. The next prime is 20861317. The reversal of 20861315 is 51316802.

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 20861315 - 2¹⁶ = 20795779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20861317) 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, 9605 + ... + 11574.

It is an arithmetic number, because the mean of its divisors is an integer number (3145230).

Almost surely, 2^20861315 is an apocalyptic number.

20861315 is a deficient number, since it is larger than the sum of its proper divisors (4300525).

20861315 is a wasteful number, since it uses less digits than its factorization.

20861315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21381.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20861315 is about 4567.4188553274. The cubic root of 20861315 is about 275.2837401990.

The spelling of 20861315 in words is "twenty million, eight hundred sixty-one thousand, three hundred fifteen".