20418530 has 64 divisors (see below), whose sum is σ = 43390080. Its totient is φ = 6835200.

The previous prime is 20418527. The next prime is 20418551. The reversal of 20418530 is 3581402.

20418530 = 233² + 234² + ... + 419².

It is a junction number, because it is equal to n+sod(n) for n = 20418496 and 20418505.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113981 + ... + 114159.

It is an arithmetic number, because the mean of its divisors is an integer number (677970).

Almost surely, 2^20418530 is an apocalyptic number.

20418530 is an abundant number, since it is smaller than the sum of its proper divisors (22971550).

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

20418530 is a wasteful number, since it uses less digits than its factorization.

20418530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20418530 is about 4518.6867561273. The cubic root of 20418530 is about 273.3221474040.

Adding to 20418530 its reverse (3581402), we get a palindrome (23999932).

The spelling of 20418530 in words is "twenty million, four hundred eighteen thousand, five hundred thirty".