20409630 has 16 divisors (see below), whose sum is σ = 48983184. Its totient is φ = 5442560.

The previous prime is 20409601. The next prime is 20409643. The reversal of 20409630 is 3690402.

It is a self number, because there is not a number n which added to its sum of digits gives 20409630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340131 + ... + 340190.

It is an arithmetic number, because the mean of its divisors is an integer number (3061449).

Almost surely, 2^20409630 is an apocalyptic number.

20409630 is an abundant number, since it is smaller than the sum of its proper divisors (28573554).

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

20409630 is a wasteful number, since it uses less digits than its factorization.

20409630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680331.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20409630 is about 4517.7018493920. The cubic root of 20409630 is about 273.2824298756.

The spelling of 20409630 in words is "twenty million, four hundred nine thousand, six hundred thirty".