20494501 has 4 divisors (see below), whose sum is σ = 20598732. Its totient is φ = 20390272.

The previous prime is 20494499. The next prime is 20494511. The reversal of 20494501 is 10549402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10549402 = 2 ⋅5274701.

It can be written as a sum of positive squares in 2 ways, for example, as 15610401 + 4884100 = 3951^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 20494501 - 2¹ = 20494499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20494511) 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, 51820 + ... + 52213.

It is an arithmetic number, because the mean of its divisors is an integer number (5149683).

Almost surely, 2^20494501 is an apocalyptic number.

It is an amenable number.

20494501 is a deficient number, since it is larger than the sum of its proper divisors (104231).

20494501 is a wasteful number, since it uses less digits than its factorization.

20494501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104230.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20494501 is about 4527.0852653777. The cubic root of 20494501 is about 273.6607100909.

The spelling of 20494501 in words is "twenty million, four hundred ninety-four thousand, five hundred one".