2020690921 has 4 divisors (see below), whose sum is σ = 2108547072. Its totient is φ = 1932834772.

The previous prime is 2020690877. The next prime is 2020690933. The reversal of 2020690921 is 1290960202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2020690921 - 2¹⁵ = 2020658153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2020691921) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 43928041 + ... + 43928086.

It is an arithmetic number, because the mean of its divisors is an integer number (527136768).

Almost surely, 2^2020690921 is an apocalyptic number.

It is an amenable number.

2020690921 is a deficient number, since it is larger than the sum of its proper divisors (87856151).

2020690921 is an equidigital number, since it uses as much as digits as its factorization.

2020690921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87856150.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 2020690921 is about 44952.0958465787. The cubic root of 2020690921 is about 1264.2509735133.

The spelling of 2020690921 in words is "two billion, twenty million, six hundred ninety thousand, nine hundred twenty-one".