20217013155 has 48 divisors (see below), whose sum is σ = 36883252224. Its totient is φ = 10621432800.

The previous prime is 20217013111. The next prime is 20217013181. The reversal of 20217013155 is 55131071202.

It is not a de Polignac number, because 20217013155 - 2⁷ = 20217013027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42771 + ... + 205580.

It is an arithmetic number, because the mean of its divisors is an integer number (768401088).

Almost surely, 2^20217013155 is an apocalyptic number.

20217013155 is a deficient number, since it is larger than the sum of its proper divisors (16666239069).

20217013155 is an equidigital number, since it uses as much as digits as its factorization.

20217013155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248438 (or 248426 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

Adding to 20217013155 its reverse (55131071202), we get a palindrome (75348084357).

The spelling of 20217013155 in words is "twenty billion, two hundred seventeen million, thirteen thousand, one hundred fifty-five".