20356530 has 32 divisors (see below), whose sum is σ = 48993984. Its totient is φ = 5413056.

The previous prime is 20356519. The next prime is 20356537. The reversal of 20356530 is 3565302.

It is a self number, because there is not a number n which added to its sum of digits gives 20356530.

It is not an unprimeable number, because it can be changed into a prime (20356537) 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, 13284 + ... + 14736.

It is an arithmetic number, because the mean of its divisors is an integer number (1531062).

Almost surely, 2^20356530 is an apocalyptic number.

20356530 is an abundant number, since it is smaller than the sum of its proper divisors (28637454).

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

20356530 is a wasteful number, since it uses less digits than its factorization.

20356530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 20356530 is about 4511.8211400719. The cubic root of 20356530 is about 273.0452232238.

The spelling of 20356530 in words is "twenty million, three hundred fifty-six thousand, five hundred thirty".