20815179242 has 32 divisors (see below), whose sum is σ = 36797169024. Its totient is φ = 8706052800.

The previous prime is 20815179241. The next prime is 20815179247. The reversal of 20815179242 is 24297151802.

It is a self number, because there is not a number n which added to its sum of digits gives 20815179242.

It is not an unprimeable number, because it can be changed into a prime (20815179241) 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, 24134 + ... + 205457.

It is an arithmetic number, because the mean of its divisors is an integer number (1149911532).

Almost surely, 2^20815179242 is an apocalyptic number.

20815179242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20815179242 is a deficient number, since it is larger than the sum of its proper divisors (15981989782).

20815179242 is a wasteful number, since it uses less digits than its factorization.

20815179242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229934.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 20815179242 in words is "twenty billion, eight hundred fifteen million, one hundred seventy-nine thousand, two hundred forty-two".