20698280 has 16 divisors (see below), whose sum is σ = 46571220. Its totient is φ = 8279296.

The previous prime is 20698273. The next prime is 20698303. The reversal of 20698280 is 8289602.

It can be written as a sum of positive squares in 2 ways, for example, as 16957924 + 3740356 = 4118^2 + 1934^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20698280.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258689 + ... + 258768.

Almost surely, 2^20698280 is an apocalyptic number.

20698280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20698280 is an abundant number, since it is smaller than the sum of its proper divisors (25872940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20698280 is a wasteful number, since it uses less digits than its factorization.

20698280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517468 (or 517464 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20698280 is about 4549.5362401018. The cubic root of 20698280 is about 274.5647329150.

The spelling of 20698280 in words is "twenty million, six hundred ninety-eight thousand, two hundred eighty".