20904246 has 48 divisors (see below), whose sum is σ = 50139648. Its totient is φ = 6241200.

The previous prime is 20904227. The next prime is 20904251. The reversal of 20904246 is 64240902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13315 + ... + 14801.

It is an arithmetic number, because the mean of its divisors is an integer number (1044576).

Almost surely, 2^20904246 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20904246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25069824).

20904246 is an abundant number, since it is smaller than the sum of its proper divisors (29235402).

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

20904246 is a wasteful number, since it uses less digits than its factorization.

20904246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577 (or 1574 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20904246 is about 4572.1161402572. The cubic root of 20904246 is about 275.4724484774.

It can be divided in two parts, 2090 and 4246, that added together give a palindrome (6336).

The spelling of 20904246 in words is "twenty million, nine hundred four thousand, two hundred forty-six".