20995488415 has 16 divisors (see below), whose sum is σ = 27582143616. Its totient is φ = 15215479200.

The previous prime is 20995488413. The next prime is 20995488431. The reversal of 20995488415 is 51488459902.

It is not a de Polignac number, because 20995488415 - 2¹ = 20995488413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20995488413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658881 + ... + 690010.

It is an arithmetic number, because the mean of its divisors is an integer number (1723883976).

Almost surely, 2^20995488415 is an apocalyptic number.

20995488415 is a deficient number, since it is larger than the sum of its proper divisors (6586655201).

20995488415 is a wasteful number, since it uses less digits than its factorization.

20995488415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349190.

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 20995488415 in words is "twenty billion, nine hundred ninety-five million, four hundred eighty-eight thousand, four hundred fifteen".