20001545155 has 4 divisors (see below), whose sum is σ = 24001854192. Its totient is φ = 16001236120.

The previous prime is 20001545129. The next prime is 20001545197. The reversal of 20001545155 is 55154510002.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20001545155 is a prime.

It is a Duffinian number.

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, 2000154511 + ... + 2000154520.

It is an arithmetic number, because the mean of its divisors is an integer number (6000463548).

Almost surely, 2^20001545155 is an apocalyptic number.

20001545155 is a deficient number, since it is larger than the sum of its proper divisors (4000309037).

20001545155 is an equidigital number, since it uses as much as digits as its factorization.

20001545155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000309036.

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

The spelling of 20001545155 in words is "twenty billion, one million, five hundred forty-five thousand, one hundred fifty-five".