20846420 has 96 divisors (see below), whose sum is σ = 55883520. Its totient is φ = 6359040.

The previous prime is 20846417. The next prime is 20846431. The reversal of 20846420 is 2464802.

It is a self number, because there is not a number n which added to its sum of digits gives 20846420.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 44990 + ... + 45450.

It is an arithmetic number, because the mean of its divisors is an integer number (582120).

Almost surely, 2^20846420 is an apocalyptic number.

20846420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20846420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27941760).

20846420 is an abundant number, since it is smaller than the sum of its proper divisors (35037100).

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

20846420 is a wasteful number, since it uses less digits than its factorization.

20846420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 20846420 is about 4565.7879933260. The cubic root of 20846420 is about 275.2182069766.

The spelling of 20846420 in words is "twenty million, eight hundred forty-six thousand, four hundred twenty".