20055620 has 24 divisors (see below), whose sum is σ = 45357144. Its totient is φ = 7405056.

The previous prime is 20055619. The next prime is 20055643. The reversal of 20055620 is 2655002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3147076 + 16908544 = 1774^2 + 4112^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20055592 and 20055601.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38309 + ... + 38828.

It is an arithmetic number, because the mean of its divisors is an integer number (1889881).

Almost surely, 2^20055620 is an apocalyptic number.

20055620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20055620 is an abundant number, since it is smaller than the sum of its proper divisors (25301524).

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

20055620 is a wasteful number, since it uses less digits than its factorization.

20055620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77159 (or 77157 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20055620 is about 4478.3501426307. The cubic root of 20055620 is about 271.6931552745.

The spelling of 20055620 in words is "twenty million, fifty-five thousand, six hundred twenty".