20864485 has 16 divisors (see below), whose sum is σ = 26607600. Its totient is φ = 15676416.

The previous prime is 20864483. The next prime is 20864507. The reversal of 20864485 is 58446802.

It can be written as a sum of positive squares in 8 ways, for example, as 1653796 + 19210689 = 1286^2 + 4383^2 .

It is a cyclic number.

It is not a de Polignac number, because 20864485 - 2¹ = 20864483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864483) 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, 3421 + ... + 7309.

It is an arithmetic number, because the mean of its divisors is an integer number (1662975).

Almost surely, 2^20864485 is an apocalyptic number.

It is an amenable number.

20864485 is a deficient number, since it is larger than the sum of its proper divisors (5743115).

20864485 is a wasteful number, since it uses less digits than its factorization.

20864485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 20864485 is about 4567.7658652781. The cubic root of 20864485 is about 275.2976831561.

The spelling of 20864485 in words is "twenty million, eight hundred sixty-four thousand, four hundred eighty-five".