20456430 has 48 divisors (see below), whose sum is σ = 51362640. Its totient is φ = 5213824.

The previous prime is 20456419. The next prime is 20456437. The reversal of 20456430 is 3465402.

It is a self number, because there is not a number n which added to its sum of digits gives 20456430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456437) 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 23 ways as a sum of consecutive naturals, for example, 15226 + ... + 16514.

It is an arithmetic number, because the mean of its divisors is an integer number (1070055).

Almost surely, 2^20456430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20456430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25681320).

20456430 is an abundant number, since it is smaller than the sum of its proper divisors (30906210).

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

20456430 is a wasteful number, since it uses less digits than its factorization.

20456430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20456430 is about 4522.8785082069. The cubic root of 20456430 is about 273.4911524977.

The spelling of 20456430 in words is "twenty million, four hundred fifty-six thousand, four hundred thirty".