20540620 has 12 divisors (see below), whose sum is σ = 43135344. Its totient is φ = 8216240.

The previous prime is 20540609. The next prime is 20540629. The reversal of 20540620 is 2604502.

It is not an unprimeable number, because it can be changed into a prime (20540629) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 513496 + ... + 513535.

It is an arithmetic number, because the mean of its divisors is an integer number (3594612).

Almost surely, 2^20540620 is an apocalyptic number.

20540620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20540620 is an abundant number, since it is smaller than the sum of its proper divisors (22594724).

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

20540620 is a wasteful number, since it uses less digits than its factorization.

20540620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027040 (or 1027038 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20540620 is about 4532.1760777799. The cubic root of 20540620 is about 273.8658302039.

The spelling of 20540620 in words is "twenty million, five hundred forty thousand, six hundred twenty".