20406830 has 16 divisors (see below), whose sum is σ = 36837504. Its totient is φ = 8139360.

The previous prime is 20406829. The next prime is 20406833. The reversal of 20406830 is 3860402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20406796 and 20406805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406833) 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 7 ways as a sum of consecutive naturals, for example, 995 + ... + 6465.

It is an arithmetic number, because the mean of its divisors is an integer number (2302344).

Almost surely, 2^20406830 is an apocalyptic number.

20406830 is a deficient number, since it is larger than the sum of its proper divisors (16430674).

20406830 is a wasteful number, since it uses less digits than its factorization.

20406830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5851.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20406830 is about 4517.3919466878. The cubic root of 20406830 is about 273.2699320858.

The spelling of 20406830 in words is "twenty million, four hundred six thousand, eight hundred thirty".