2020154891 has 4 divisors (see below), whose sum is σ = 2020244952. Its totient is φ = 2020064832.

The previous prime is 2020154827. The next prime is 2020154923. The reversal of 2020154891 is 1984510202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1984510202 = 2 ⋅992255101.

It is a cyclic number.

It is not a de Polignac number, because 2020154891 - 2⁶ = 2020154827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2020154291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18395 + ... + 66171.

It is an arithmetic number, because the mean of its divisors is an integer number (505061238).

Almost surely, 2^2020154891 is an apocalyptic number.

2020154891 is a deficient number, since it is larger than the sum of its proper divisors (90061).

2020154891 is an equidigital number, since it uses as much as digits as its factorization.

2020154891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90060.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 2020154891 is about 44946.1332152166. The cubic root of 2020154891 is about 1264.1391740666.

The spelling of 2020154891 in words is "two billion, twenty million, one hundred fifty-four thousand, eight hundred ninety-one".