20553630 has 64 divisors (see below), whose sum is σ = 52565760. Its totient is φ = 5128704.

The previous prime is 20553623. The next prime is 20553647. The reversal of 20553630 is 3635502.

It is a self number, because there is not a number n which added to its sum of digits gives 20553630.

It is a congruent number.

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, 60822 + ... + 61158.

It is an arithmetic number, because the mean of its divisors is an integer number (821340).

Almost surely, 2^20553630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20553630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26282880).

20553630 is an abundant number, since it is smaller than the sum of its proper divisors (32012130).

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

20553630 is a wasteful number, since it uses less digits than its factorization.

20553630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 20553630 is about 4533.6111434485. The cubic root of 20553630 is about 273.9236383011.

It can be divided in two parts, 205 and 53630, that added together give a palindrome (53835).

The spelling of 20553630 in words is "twenty million, five hundred fifty-three thousand, six hundred thirty".