20860389 has 16 divisors (see below), whose sum is σ = 33714240. Its totient is φ = 12642480.

The previous prime is 20860387. The next prime is 20860391. The reversal of 20860389 is 98306802.

It is an interprime number because it is at equal distance from previous prime (20860387) and next prime (20860391).

It is not a de Polignac number, because 20860389 - 2¹ = 20860387 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20860387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34822 + ... + 35415.

It is an arithmetic number, because the mean of its divisors is an integer number (2107140).

Almost surely, 2^20860389 is an apocalyptic number.

It is an amenable number.

20860389 is a deficient number, since it is larger than the sum of its proper divisors (12853851).

20860389 is a wasteful number, since it uses less digits than its factorization.

20860389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70257 (or 70251 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20860389 is about 4567.3174840381. The cubic root of 20860389 is about 275.2796670055.

The spelling of 20860389 in words is "twenty million, eight hundred sixty thousand, three hundred eighty-nine".