20493547 has 4 divisors (see below), whose sum is σ = 20517640. Its totient is φ = 20469456.

The previous prime is 20493541. The next prime is 20493553. The reversal of 20493547 is 74539402.

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

It is an interprime number because it is at equal distance from previous prime (20493541) and next prime (20493553).

It is a cyclic number.

It is not a de Polignac number, because 20493547 - 2¹⁵ = 20460779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20493541) 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, 10722 + ... + 12487.

It is an arithmetic number, because the mean of its divisors is an integer number (5129410).

Almost surely, 2^20493547 is an apocalyptic number.

20493547 is a deficient number, since it is larger than the sum of its proper divisors (24093).

20493547 is an equidigital number, since it uses as much as digits as its factorization.

20493547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24092.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20493547 is about 4526.9798983428. The cubic root of 20493547 is about 273.6564638077.

The spelling of 20493547 in words is "twenty million, four hundred ninety-three thousand, five hundred forty-seven".