20504250 has 96 divisors (see below), whose sum is σ = 59793552. Its totient is φ = 5040000.

The previous prime is 20504221. The next prime is 20504353. The reversal of 20504250 is 5240502.

It can be written as a sum of positive squares in 8 ways, for example, as 710649 + 19793601 = 843^2 + 4449^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

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, 28900 + ... + 29600.

Almost surely, 2^20504250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20504250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29896776).

20504250 is an abundant number, since it is smaller than the sum of its proper divisors (39289302).

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

20504250 is a wasteful number, since it uses less digits than its factorization.

20504250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20504250 is about 4528.1618787318. The cubic root of 20504250 is about 273.7040956368.

Adding to 20504250 its reverse (5240502), we get a palindrome (25744752).

The spelling of 20504250 in words is "twenty million, five hundred four thousand, two hundred fifty".