20204250 has 128 divisors (see below), whose sum is σ = 57507840. Its totient is φ = 4680000.

The previous prime is 20204243. The next prime is 20204269. The reversal of 20204250 is 5240202.

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, 255711 + ... + 255789.

It is an arithmetic number, because the mean of its divisors is an integer number (449280).

Almost surely, 2^20204250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20204250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28753920).

20204250 is an abundant number, since it is smaller than the sum of its proper divisors (37303590).

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

20204250 is a wasteful number, since it uses less digits than its factorization.

20204250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20204250 is about 4494.9137922768. The cubic root of 20204250 is about 272.3626668202.

Adding to 20204250 its reverse (5240202), we get a palindrome (25444452).

The spelling of 20204250 in words is "twenty million, two hundred four thousand, two hundred fifty".