20201520155 has 16 divisors (see below), whose sum is σ = 25992731520. Its totient is φ = 15018012672.

The previous prime is 20201520133. The next prime is 20201520161. The reversal of 20201520155 is 55102510202.

It is a cyclic number.

It is not a de Polignac number, because 20201520155 - 2¹² = 20201516059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20201520155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1497494 + ... + 1510923.

It is an arithmetic number, because the mean of its divisors is an integer number (1624545720).

Almost surely, 2^20201520155 is an apocalyptic number.

20201520155 is a deficient number, since it is larger than the sum of its proper divisors (5791211365).

20201520155 is a wasteful number, since it uses less digits than its factorization.

20201520155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008518.

The product of its (nonzero) digits is 1000, while the sum is 23.

The spelling of 20201520155 in words is "twenty billion, two hundred one million, five hundred twenty thousand, one hundred fifty-five".