20581296 has 20 divisors (see below), whose sum is σ = 53168472. Its totient is φ = 6860416.

The previous prime is 20581277. The next prime is 20581333. The reversal of 20581296 is 69218502.

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 3 ways as a sum of consecutive naturals, for example, 214341 + ... + 214436.

Almost surely, 2^20581296 is an apocalyptic number.

It is an amenable number.

20581296 is an abundant number, since it is smaller than the sum of its proper divisors (32587176).

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

20581296 is a wasteful number, since it uses less digits than its factorization.

20581296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428788 (or 428782 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20581296 is about 4536.6613274522. The cubic root of 20581296 is about 274.0464872196.

Adding to 20581296 its reverse (69218502), we get a palindrome (89799798).

The spelling of 20581296 in words is "twenty million, five hundred eighty-one thousand, two hundred ninety-six".