20280315 has 32 divisors (see below), whose sum is σ = 37267200. Its totient is φ = 9313920.

The previous prime is 20280311. The next prime is 20280347. The reversal of 20280315 is 51308202.

It is not a de Polignac number, because 20280315 - 2² = 20280311 is a prime.

It is a super-2 number, since 2×20280315² = 822582352998450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20280291 and 20280300.

It is not an unprimeable number, because it can be changed into a prime (20280311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100 + ... + 6369.

It is an arithmetic number, because the mean of its divisors is an integer number (1164600).

Almost surely, 2^20280315 is an apocalyptic number.

20280315 is a deficient number, since it is larger than the sum of its proper divisors (16986885).

20280315 is a wasteful number, since it uses less digits than its factorization.

20280315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6507.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20280315 is about 4503.3670736461. The cubic root of 20280315 is about 272.7040359495.

Adding to 20280315 its reverse (51308202), we get a palindrome (71588517).

The spelling of 20280315 in words is "twenty million, two hundred eighty thousand, three hundred fifteen".