20487085 has 24 divisors (see below), whose sum is σ = 26237736. Its totient is φ = 15344640.

The previous prime is 20487083. The next prime is 20487107. The reversal of 20487085 is 58078402.

It can be written as a sum of positive squares in 12 ways, for example, as 1320201 + 19166884 = 1149^2 + 4378^2 .

It is not a de Polignac number, because 20487085 - 2¹ = 20487083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20487085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487083) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280609 + ... + 280681.

It is an arithmetic number, because the mean of its divisors is an integer number (1093239).

Almost surely, 2^20487085 is an apocalyptic number.

It is an amenable number.

20487085 is a deficient number, since it is larger than the sum of its proper divisors (5750651).

20487085 is an equidigital number, since it uses as much as digits as its factorization.

20487085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 20487085 is about 4526.2661212085. The cubic root of 20487085 is about 273.6276977776.

The spelling of 20487085 in words is "twenty million, four hundred eighty-seven thousand, eighty-five".