20451828 has 48 divisors (see below), whose sum is σ = 50570240. Its totient is φ = 6415200.

The previous prime is 20451811. The next prime is 20451839. The reversal of 20451828 is 82815402.

It is a junction number, because it is equal to n+sod(n) for n = 20451795 and 20451804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61623 + ... + 61953.

Almost surely, 2^20451828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20451828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25285120).

20451828 is an abundant number, since it is smaller than the sum of its proper divisors (30118412).

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

20451828 is a wasteful number, since it uses less digits than its factorization.

20451828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20451828 is about 4522.3697327839. The cubic root of 20451828 is about 273.4706422282.

The spelling of 20451828 in words is "twenty million, four hundred fifty-one thousand, eight hundred twenty-eight".