20621196 has 48 divisors (see below), whose sum is σ = 54778080. Its totient is φ = 6704640.

The previous prime is 20621191. The next prime is 20621239. The reversal of 20621196 is 69112602.

20621196 is a `hidden beast` number, since 20 + 621 + 19 + 6 = 666.

It is a super-3 number, since 3×20621196³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20621191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2100 + ... + 6756.

It is an arithmetic number, because the mean of its divisors is an integer number (1141210).

Almost surely, 2^20621196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20621196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27389040).

20621196 is an abundant number, since it is smaller than the sum of its proper divisors (34156884).

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

20621196 is a wasteful number, since it uses less digits than its factorization.

20621196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4711 (or 4703 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20621196 is about 4541.0567052174. The cubic root of 20621196 is about 274.2234666221.

Adding to 20621196 its reverse (69112602), we get a palindrome (89733798).

The spelling of 20621196 in words is "twenty million, six hundred twenty-one thousand, one hundred ninety-six".