20461530 has 48 divisors (see below), whose sum is σ = 50922144. Its totient is φ = 5261760.

The previous prime is 20461517. The next prime is 20461541. The reversal of 20461530 is 3516402.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20461497 and 20461506.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24825 + ... + 25635.

It is an arithmetic number, because the mean of its divisors is an integer number (1060878).

Almost surely, 2^20461530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20461530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25461072).

20461530 is an abundant number, since it is smaller than the sum of its proper divisors (30460614).

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

20461530 is a wasteful number, since it uses less digits than its factorization.

20461530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879 (or 850 counting only the distinct ones).

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

The square root of 20461530 is about 4523.4422733135. The cubic root of 20461530 is about 273.5138786688.

Adding to 20461530 its reverse (3516402), we get a palindrome (23977932).

The spelling of 20461530 in words is "twenty million, four hundred sixty-one thousand, five hundred thirty".