20415136009 has 4 divisors (see below), whose sum is σ = 20418754320. Its totient is φ = 20411517700.

The previous prime is 20415135991. The next prime is 20415136019. The reversal of 20415136009 is 90063151402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20415136009 - 2¹⁷ = 20415004937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415136019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800679 + ... + 1811980.

It is an arithmetic number, because the mean of its divisors is an integer number (5104688580).

Almost surely, 2^20415136009 is an apocalyptic number.

It is an amenable number.

20415136009 is a deficient number, since it is larger than the sum of its proper divisors (3618311).

20415136009 is an equidigital number, since it uses as much as digits as its factorization.

20415136009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618310.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 20415136009 in words is "twenty billion, four hundred fifteen million, one hundred thirty-six thousand, nine".