20626398 has 48 divisors (see below), whose sum is σ = 48493536. Its totient is φ = 6298560.

The previous prime is 20626391. The next prime is 20626399. The reversal of 20626398 is 89362602.

20626398 is a `hidden beast` number, since 20 + 626 + 3 + 9 + 8 = 666.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20626391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42111 + ... + 42597.

It is an arithmetic number, because the mean of its divisors is an integer number (1010282).

Almost surely, 2^20626398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20626398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24246768).

20626398 is an abundant number, since it is smaller than the sum of its proper divisors (27867138).

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

20626398 is a wasteful number, since it uses less digits than its factorization.

20626398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20626398 is about 4541.6294432725. The cubic root of 20626398 is about 274.2465236510.

The spelling of 20626398 in words is "twenty million, six hundred twenty-six thousand, three hundred ninety-eight".