20545530 has 32 divisors (see below), whose sum is σ = 49939200. Its totient is φ = 5408832.

The previous prime is 20545493. The next prime is 20545531. The reversal of 20545530 is 3554502.

It is a self number, because there is not a number n which added to its sum of digits gives 20545530.

It is not an unprimeable number, because it can be changed into a prime (20545531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1965 + ... + 6704.

It is an arithmetic number, because the mean of its divisors is an integer number (1560600).

Almost surely, 2^20545530 is an apocalyptic number.

20545530 is an abundant number, since it is smaller than the sum of its proper divisors (29393670).

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

20545530 is a wasteful number, since it uses less digits than its factorization.

20545530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8758.

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 20545530 is about 4532.7177278097. The cubic root of 20545530 is about 273.8876499623.

The spelling of 20545530 in words is "twenty million, five hundred forty-five thousand, five hundred thirty".