20501045155 has 8 divisors (see below), whose sum is σ = 24938258112. Its totient is φ = 16176166848.

The previous prime is 20501045153. The next prime is 20501045177. The reversal of 20501045155 is 55154010502.

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

It is a cyclic number.

It is not a de Polignac number, because 20501045155 - 2¹ = 20501045153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501045153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28083259 + ... + 28083988.

It is an arithmetic number, because the mean of its divisors is an integer number (3117282264).

Almost surely, 2^20501045155 is an apocalyptic number.

20501045155 is a deficient number, since it is larger than the sum of its proper divisors (4437212957).

20501045155 is an equidigital number, since it uses as much as digits as its factorization.

20501045155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56167325.

The product of its (nonzero) digits is 5000, while the sum is 28.

Adding to 20501045155 its reverse (55154010502), we get a palindrome (75655055657).

The spelling of 20501045155 in words is "twenty billion, five hundred one million, forty-five thousand, one hundred fifty-five".