20616930 has 40 divisors (see below), whose sum is σ = 55438812. Its totient is φ = 5497632.

The previous prime is 20616923. The next prime is 20616931. The reversal of 20616930 is 3961602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20493729 + 123201 = 4527^2 + 351^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20616894 and 20616903.

It is not an unprimeable number, because it can be changed into a prime (20616931) 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 19 ways as a sum of consecutive naturals, for example, 11917 + ... + 13536.

Almost surely, 2^20616930 is an apocalyptic number.

20616930 is an abundant number, since it is smaller than the sum of its proper divisors (34821882).

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

20616930 is a wasteful number, since it uses less digits than its factorization.

20616930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25472 (or 25463 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20616930 is about 4540.5869664615. The cubic root of 20616930 is about 274.2045553687.

The spelling of 20616930 in words is "twenty million, six hundred sixteen thousand, nine hundred thirty".