20516430 has 32 divisors (see below), whose sum is σ = 53716608. Its totient is φ = 4973600.

The previous prime is 20516423. The next prime is 20516471. The reversal of 20516430 is 3461502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20516397 and 20516406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30756 + ... + 31415.

It is an arithmetic number, because the mean of its divisors is an integer number (1678644).

Almost surely, 2^20516430 is an apocalyptic number.

20516430 is an abundant number, since it is smaller than the sum of its proper divisors (33200178).

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

20516430 is a wasteful number, since it uses less digits than its factorization.

20516430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62192.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20516430 is about 4529.5065956459. The cubic root of 20516430 is about 273.7582804359.

Adding to 20516430 its reverse (3461502), we get a palindrome (23977932).

The spelling of 20516430 in words is "twenty million, five hundred sixteen thousand, four hundred thirty".