20409388 has 18 divisors (see below), whose sum is σ = 36996596. Its totient is φ = 9851184.

The previous prime is 20409383. The next prime is 20409437. The reversal of 20409388 is 88390402.

It is not an unprimeable number, because it can be changed into a prime (20409383) 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 5 ways as a sum of consecutive naturals, for example, 331 + ... + 6397.

Almost surely, 2^20409388 is an apocalyptic number.

It is an amenable number.

20409388 is a deficient number, since it is larger than the sum of its proper divisors (16587208).

20409388 is a wasteful number, since it uses less digits than its factorization.

20409388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6129 (or 6098 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20409388 is about 4517.6750657833. The cubic root of 20409388 is about 273.2813497546.

The spelling of 20409388 in words is "twenty million, four hundred nine thousand, three hundred eighty-eight".