20398285 has 8 divisors (see below), whose sum is σ = 25139736. Its totient is φ = 15877440.

The previous prime is 20398277. The next prime is 20398289. The reversal of 20398285 is 58289302.

It can be written as a sum of positive squares in 4 ways, for example, as 6041764 + 14356521 = 2458^2 + 3789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20398285 - 2³ = 20398277 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20398289) 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, 54946 + ... + 55315.

It is an arithmetic number, because the mean of its divisors is an integer number (3142467).

Almost surely, 2^20398285 is an apocalyptic number.

It is an amenable number.

20398285 is a deficient number, since it is larger than the sum of its proper divisors (4741451).

20398285 is a wasteful number, since it uses less digits than its factorization.

20398285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110303.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 20398285 is about 4516.4460585730. The cubic root of 20398285 is about 273.2317844399.

The spelling of 20398285 in words is "twenty million, three hundred ninety-eight thousand, two hundred eighty-five".