20497753 has 4 divisors (see below), whose sum is σ = 20539008. Its totient is φ = 20456500.

The previous prime is 20497717. The next prime is 20497811. The reversal of 20497753 is 35779402.

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 20497753 - 2¹³ = 20489561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20497553) 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, 19873 + ... + 20878.

It is an arithmetic number, because the mean of its divisors is an integer number (5134752).

Almost surely, 2^20497753 is an apocalyptic number.

It is an amenable number.

20497753 is a deficient number, since it is larger than the sum of its proper divisors (41255).

20497753 is an equidigital number, since it uses as much as digits as its factorization.

20497753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41254.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 20497753 is about 4527.4444226296. Note that the first 4 decimals coincide. The cubic root of 20497753 is about 273.6751838525.

The spelling of 20497753 in words is "twenty million, four hundred ninety-seven thousand, seven hundred fifty-three".