20537430 has 16 divisors (see below), whose sum is σ = 49289904. Its totient is φ = 5476640.

The previous prime is 20537401. The next prime is 20537431. The reversal of 20537430 is 3473502.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20537430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20537431) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 342261 + ... + 342320.

It is an arithmetic number, because the mean of its divisors is an integer number (3080619).

Almost surely, 2^20537430 is an apocalyptic number.

20537430 is an abundant number, since it is smaller than the sum of its proper divisors (28752474).

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

20537430 is a wasteful number, since it uses less digits than its factorization.

20537430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684591.

The product of its (nonzero) digits is 2520, while the sum is 24.

The square root of 20537430 is about 4531.8241360406. The cubic root of 20537430 is about 273.8516521633.

The spelling of 20537430 in words is "twenty million, five hundred thirty-seven thousand, four hundred thirty".