20415009 has 8 divisors (see below), whose sum is σ = 27955840. Its totient is φ = 13242096.

The previous prime is 20414993. The next prime is 20415013. The reversal of 20415009 is 90051402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20415009 - 2⁴ = 20414993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91849 + ... + 92070.

It is an arithmetic number, because the mean of its divisors is an integer number (3494480).

Almost surely, 2^20415009 is an apocalyptic number.

It is an amenable number.

20415009 is a deficient number, since it is larger than the sum of its proper divisors (7540831).

20415009 is a wasteful number, since it uses less digits than its factorization.

20415009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183959.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20415009 is about 4518.2971349835. The cubic root of 20415009 is about 273.3064358158.

The spelling of 20415009 in words is "twenty million, four hundred fifteen thousand, nine".