20190450 has 144 divisors (see below), whose sum is σ = 60558624. Its totient is φ = 4435200.

The previous prime is 20190439. The next prime is 20190461. The reversal of 20190450 is 5409102.

It is an interprime number because it is at equal distance from previous prime (20190439) and next prime (20190461).

It is a Harshad number since it is a multiple of its sum of digits (21).

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 71 ways as a sum of consecutive naturals, for example, 301317 + ... + 301383.

It is an arithmetic number, because the mean of its divisors is an integer number (420546).

Almost surely, 2^20190450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20190450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30279312).

20190450 is an abundant number, since it is smaller than the sum of its proper divisors (40368174).

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

20190450 is a wasteful number, since it uses less digits than its factorization.

20190450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20190450 is about 4493.3784616923. The cubic root of 20190450 is about 272.3006425619.

Adding to 20190450 its reverse (5409102), we get a palindrome (25599552).

The spelling of 20190450 in words is "twenty million, one hundred ninety thousand, four hundred fifty".