20548540 has 12 divisors (see below), whose sum is σ = 43151976. Its totient is φ = 8219408.

The previous prime is 20548531. The next prime is 20548543. The reversal of 20548540 is 4584502.

It is a super-2 number, since 2×20548540² = 844484992263200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20548499 and 20548508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20548543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513694 + ... + 513733.

It is an arithmetic number, because the mean of its divisors is an integer number (3595998).

Almost surely, 2^20548540 is an apocalyptic number.

20548540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20548540 is an abundant number, since it is smaller than the sum of its proper divisors (22603436).

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

20548540 is a wasteful number, since it uses less digits than its factorization.

20548540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027436 (or 1027434 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 20548540 is about 4533.0497460319. The cubic root of 20548540 is about 273.9010245109.

The spelling of 20548540 in words is "twenty million, five hundred forty-eight thousand, five hundred forty".