20647415155 has 8 divisors (see below), whose sum is σ = 24779183184. Its totient is φ = 16516408800.

The previous prime is 20647415141. The next prime is 20647415171. The reversal of 20647415155 is 55151474602.

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

It is not a de Polignac number, because 20647415155 - 2⁹ = 20647414643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128976 + ... + 240685.

It is an arithmetic number, because the mean of its divisors is an integer number (3097397898).

Almost surely, 2^20647415155 is an apocalyptic number.

20647415155 is a deficient number, since it is larger than the sum of its proper divisors (4131768029).

20647415155 is a wasteful number, since it uses less digits than its factorization.

20647415155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380837.

The product of its (nonzero) digits is 168000, while the sum is 40.

Adding to 20647415155 its reverse (55151474602), we get a palindrome (75798889757).

The spelling of 20647415155 in words is "twenty billion, six hundred forty-seven million, four hundred fifteen thousand, one hundred fifty-five".