20451396 has 24 divisors (see below), whose sum is σ = 54537280. Its totient is φ = 5843232.

The previous prime is 20451373. The next prime is 20451397. The reversal of 20451396 is 69315402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121651 + ... + 121818.

Almost surely, 2^20451396 is an apocalyptic number.

It is an amenable number.

20451396 is an abundant number, since it is smaller than the sum of its proper divisors (34085884).

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

20451396 is a wasteful number, since it uses less digits than its factorization.

20451396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243483 (or 243481 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20451396 is about 4522.3219699619. The cubic root of 20451396 is about 273.4687167256.

Adding to 20451396 its reverse (69315402), we get a palindrome (89766798).

The spelling of 20451396 in words is "twenty million, four hundred fifty-one thousand, three hundred ninety-six".