20406630 has 32 divisors (see below), whose sum is σ = 51858144. Its totient is φ = 5121536.

The previous prime is 20406611. The next prime is 20406641. The reversal of 20406630 is 3660402.

It is a junction number, because it is equal to n+sod(n) for n = 20406597 and 20406606.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19497 + ... + 20516.

It is an arithmetic number, because the mean of its divisors is an integer number (1620567).

Almost surely, 2^20406630 is an apocalyptic number.

20406630 is an abundant number, since it is smaller than the sum of its proper divisors (31451514).

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

20406630 is a wasteful number, since it uses less digits than its factorization.

20406630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40040.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20406630 is about 4517.3698099669. The cubic root of 20406630 is about 273.2690393428.

The spelling of 20406630 in words is "twenty million, four hundred six thousand, six hundred thirty".