20409322815 has 128 divisors (see below), whose sum is σ = 43787520000. Its totient is φ = 8810892288.

The previous prime is 20409322811. The next prime is 20409322831. The reversal of 20409322815 is 51822390402.

It is a happy number.

20409322815 is a `hidden beast` number, since 20 + 409 + 3 + 228 + 1 + 5 = 666.

It is not a de Polignac number, because 20409322815 - 2² = 20409322811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20409322815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20409322811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6264667 + ... + 6267923.

It is an arithmetic number, because the mean of its divisors is an integer number (342090000).

Almost surely, 2^20409322815 is an apocalyptic number.

20409322815 is an abundant number, since it is smaller than the sum of its proper divisors (23378197185).

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

20409322815 is a wasteful number, since it uses less digits than its factorization.

20409322815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646 (or 3640 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20409322815 in words is "twenty billion, four hundred nine million, three hundred twenty-two thousand, eight hundred fifteen".