20630540 has 96 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 6564096.

The previous prime is 20630507. The next prime is 20630543. The reversal of 20630540 is 4503602.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20630543) 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 31 ways as a sum of consecutive naturals, for example, 138386 + ... + 138534.

It is an arithmetic number, because the mean of its divisors is an integer number (554400).

Almost surely, 2^20630540 is an apocalyptic number.

20630540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20630540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611200).

20630540 is an abundant number, since it is smaller than the sum of its proper divisors (32591860).

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

20630540 is a wasteful number, since it uses less digits than its factorization.

20630540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20630540 is about 4542.0854241196. The cubic root of 20630540 is about 274.2648796282.

The spelling of 20630540 in words is "twenty million, six hundred thirty thousand, five hundred forty".