20530355 has 16 divisors (see below), whose sum is σ = 26088480. Its totient is φ = 15466752.

The previous prime is 20530351. The next prime is 20530397. The reversal of 20530355 is 55303502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20530355 - 2² = 20530351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20530355.

It is not an unprimeable number, because it can be changed into a prime (20530351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18167 + ... + 19263.

It is an arithmetic number, because the mean of its divisors is an integer number (1630530).

Almost surely, 2^20530355 is an apocalyptic number.

20530355 is a deficient number, since it is larger than the sum of its proper divisors (5558125).

20530355 is a wasteful number, since it uses less digits than its factorization.

20530355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 2250, while the sum is 23.

The square root of 20530355 is about 4531.0434780523. The cubic root of 20530355 is about 273.8202018964.

Adding to 20530355 its reverse (55303502), we get a palindrome (75833857).

The spelling of 20530355 in words is "twenty million, five hundred thirty thousand, three hundred fifty-five".