20615561106 has 16 divisors (see below), whose sum is σ = 47121282624. Its totient is φ = 5890160304.

The previous prime is 20615561101. The next prime is 20615561107. The reversal of 20615561106 is 60116551602.

It is not an unprimeable number, because it can be changed into a prime (20615561101) 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, 245423305 + ... + 245423388.

It is an arithmetic number, because the mean of its divisors is an integer number (2945080164).

Almost surely, 2^20615561106 is an apocalyptic number.

20615561106 is an abundant number, since it is smaller than the sum of its proper divisors (26505721518).

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

20615561106 is a wasteful number, since it uses less digits than its factorization.

20615561106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490846705.

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 20615561106 in words is "twenty billion, six hundred fifteen million, five hundred sixty-one thousand, one hundred six".