20606015639978 has 8 divisors (see below), whose sum is σ = 31627837959168. Its totient is φ = 10063402986924.

The previous prime is 20606015639953. The next prime is 20606015640053. The reversal of 20606015639978 is 87993651060602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20606015639978.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119802416426 + ... + 119802416597.

It is an arithmetic number, because the mean of its divisors is an integer number (3953479744896).

Almost surely, 2^{20606015639978} is an apocalyptic number.

20606015639978 is a deficient number, since it is larger than the sum of its proper divisors (11021822319190).

20606015639978 is a wasteful number, since it uses less digits than its factorization.

20606015639978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239604833068.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 20606015639978 in words is "twenty trillion, six hundred six billion, fifteen million, six hundred thirty-nine thousand, nine hundred seventy-eight".