20418450 has 96 divisors (see below), whose sum is σ = 56204736. Its totient is φ = 4872960.

The previous prime is 20418439. The next prime is 20418467. The reversal of 20418450 is 5481402.

It is a self number, because there is not a number n which added to its sum of digits gives 20418450.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72009 + ... + 72291.

It is an arithmetic number, because the mean of its divisors is an integer number (585466).

Almost surely, 2^20418450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20418450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28102368).

20418450 is an abundant number, since it is smaller than the sum of its proper divisors (35786286).

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

20418450 is a wasteful number, since it uses less digits than its factorization.

20418450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20418450 is about 4518.6779039892. The cubic root of 20418450 is about 273.3217904439.

Adding to 20418450 its reverse (5481402), we get a palindrome (25899852).

The spelling of 20418450 in words is "twenty million, four hundred eighteen thousand, four hundred fifty".