20990250 has 96 divisors (see below), whose sum is σ = 59866560. Its totient is φ = 5292000.

The previous prime is 20990243. The next prime is 20990273. The reversal of 20990250 is 5209902.

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, 42505 + ... + 42995.

It is an arithmetic number, because the mean of its divisors is an integer number (623610).

Almost surely, 2^20990250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20990250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29933280).

20990250 is an abundant number, since it is smaller than the sum of its proper divisors (38876310).

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

20990250 is a wasteful number, since it uses less digits than its factorization.

20990250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20990250 is about 4581.5117592341. The cubic root of 20990250 is about 275.8497133924.

The spelling of 20990250 in words is "twenty million, nine hundred ninety thousand, two hundred fifty".