20255620 has 72 divisors (see below), whose sum is σ = 54008640. Its totient is φ = 6310080.

The previous prime is 20255603. The next prime is 20255621. The reversal of 20255620 is 2655202.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 20255591 and 20255600.

It is not an unprimeable number, because it can be changed into a prime (20255621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9841 + ... + 11719.

It is an arithmetic number, because the mean of its divisors is an integer number (750120).

Almost surely, 2^20255620 is an apocalyptic number.

20255620 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 20255620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27004320).

20255620 is an abundant number, since it is smaller than the sum of its proper divisors (33753020).

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

20255620 is a wasteful number, since it uses less digits than its factorization.

20255620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913 (or 1904 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20255620 is about 4500.6244011248. The cubic root of 20255620 is about 272.5933019449.

The spelling of 20255620 in words is "twenty million, two hundred fifty-five thousand, six hundred twenty".