20555964 has 120 divisors (see below), whose sum is σ = 63131600. Its totient is φ = 5749920.

The previous prime is 20555957. The next prime is 20555971. The reversal of 20555964 is 46955502.

It is an interprime number because it is at equal distance from previous prime (20555957) and next prime (20555971).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 39 ways as a sum of consecutive naturals, for example, 1581222 + ... + 1581234.

Almost surely, 2^20555964 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 20555964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31565800).

20555964 is an abundant number, since it is smaller than the sum of its proper divisors (42575636).

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

20555964 is a wasteful number, since it uses less digits than its factorization.

20555964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 20555964 is about 4533.8685468372. The cubic root of 20555964 is about 273.9340065195.

It can be divided in two parts, 205 and 55964, that added together give a square (56169 = 237²).

The spelling of 20555964 in words is "twenty million, five hundred fifty-five thousand, nine hundred sixty-four".