20553102 has 60 divisors (see below), whose sum is σ = 49034040. Its totient is φ = 6433344.

The previous prime is 20553089. The next prime is 20553107. The reversal of 20553102 is 20135502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553107) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 46599 + ... + 47037.

It is an arithmetic number, because the mean of its divisors is an integer number (817234).

Almost surely, 2^20553102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20553102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24517020).

20553102 is an abundant number, since it is smaller than the sum of its proper divisors (28480938).

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

20553102 is a wasteful number, since it uses less digits than its factorization.

20553102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20553102 is about 4533.5529113489. The cubic root of 20553102 is about 273.9212926826.

Adding to 20553102 its reverse (20135502), we get a palindrome (40688604).

The spelling of 20553102 in words is "twenty million, five hundred fifty-three thousand, one hundred two".