20553000 has 256 divisors, whose sum is σ = 75479040. Its totient is φ = 4608000.

The previous prime is 20552999. The next prime is 20553023. The reversal of 20553000 is 35502.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 662985 + ... + 663015.

It is an arithmetic number, because the mean of its divisors is an integer number (294840).

Almost surely, 2^20553000 is an apocalyptic number.

20553000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20553000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37739520).

20553000 is an abundant number, since it is smaller than the sum of its proper divisors (54926040).

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

20553000 is a wasteful number, since it uses less digits than its factorization.

20553000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 15.

The square root of 20553000 is about 4533.5416618798. The cubic root of 20553000 is about 273.9208395472.

Adding to 20553000 its reverse (35502), we get a palindrome (20588502).

The spelling of 20553000 in words is "twenty million, five hundred fifty-three thousand".