20409396 has 48 divisors (see below), whose sum is σ = 54714240. Its totient is φ = 5800320.

The previous prime is 20409383. The next prime is 20409437. The reversal of 20409396 is 69390402.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 18706 + ... + 19766.

It is an arithmetic number, because the mean of its divisors is an integer number (1139880).

Almost surely, 2^20409396 is an apocalyptic number.

It is an amenable number.

20409396 is an abundant number, since it is smaller than the sum of its proper divisors (34304844).

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

20409396 is a wasteful number, since it uses less digits than its factorization.

20409396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20409396 is about 4517.6759511944. The cubic root of 20409396 is about 273.2813854612.

Adding to 20409396 its reverse (69390402), we get a palindrome (89799798).

The spelling of 20409396 in words is "twenty million, four hundred nine thousand, three hundred ninety-six".