20273491 has 4 divisors (see below), whose sum is σ = 23169712. Its totient is φ = 17377272.

The previous prime is 20273479. The next prime is 20273501. The reversal of 20273491 is 19437202.

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

It is a cyclic number.

It is not a de Polignac number, because 20273491 - 2⁹ = 20272979 is a prime.

It is a super-2 number, since 2×20273491² = 822028874654162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20273431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1448100 + ... + 1448113.

It is an arithmetic number, because the mean of its divisors is an integer number (5792428).

Almost surely, 2^20273491 is an apocalyptic number.

20273491 is a deficient number, since it is larger than the sum of its proper divisors (2896221).

20273491 is an equidigital number, since it uses as much as digits as its factorization.

20273491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896220.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20273491 is about 4502.6093545854. The cubic root of 20273491 is about 272.6734456767.

The spelling of 20273491 in words is "twenty million, two hundred seventy-three thousand, four hundred ninety-one".