20543620 has 12 divisors (see below), whose sum is σ = 43141644. Its totient is φ = 8217440.

The previous prime is 20543609. The next prime is 20543639. The reversal of 20543620 is 2634502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3104644 + 17438976 = 1762^2 + 4176^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20543591 and 20543600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513571 + ... + 513610.

It is an arithmetic number, because the mean of its divisors is an integer number (3595137).

Almost surely, 2^20543620 is an apocalyptic number.

20543620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20543620 is an abundant number, since it is smaller than the sum of its proper divisors (22598024).

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

20543620 is a wasteful number, since it uses less digits than its factorization.

20543620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027190 (or 1027188 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20543620 is about 4532.5070325373. The cubic root of 20543620 is about 273.8791624450.

The spelling of 20543620 in words is "twenty million, five hundred forty-three thousand, six hundred twenty".