20451552 has 96 divisors (see below), whose sum is σ = 59439744. Its totient is φ = 6105600.

The previous prime is 20451551. The next prime is 20451569. The reversal of 20451552 is 25515402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451551) 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, 112902 + ... + 113082.

It is an arithmetic number, because the mean of its divisors is an integer number (619164).

Almost surely, 2^20451552 is an apocalyptic number.

20451552 is a gapful number since it is divisible by the number (22) 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 20451552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29719872).

20451552 is an abundant number, since it is smaller than the sum of its proper divisors (38988192).

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

20451552 is a wasteful number, since it uses less digits than its factorization.

20451552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 20451552 is about 4522.3392177058. The cubic root of 20451552 is about 273.4694120491.

Adding to 20451552 its reverse (25515402), we get a palindrome (45966954).

The spelling of 20451552 in words is "twenty million, four hundred fifty-one thousand, five hundred fifty-two".