20615264442 has 48 divisors (see below), whose sum is σ = 47053893120. Its totient is φ = 6505012800.

The previous prime is 20615264393. The next prime is 20615264443. The reversal of 20615264442 is 24446251602.

20615264442 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 5 + 2 + 644 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20615264397 and 20615264406.

It is not an unprimeable number, because it can be changed into a prime (20615264443) 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 23 ways as a sum of consecutive naturals, for example, 428967 + ... + 474597.

It is an arithmetic number, because the mean of its divisors is an integer number (980289440).

Almost surely, 2^20615264442 is an apocalyptic number.

20615264442 is an abundant number, since it is smaller than the sum of its proper divisors (26438628678).

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

20615264442 is a wasteful number, since it uses less digits than its factorization.

20615264442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46979 (or 46976 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 20615264442 in words is "twenty billion, six hundred fifteen million, two hundred sixty-four thousand, four hundred forty-two".