20540501 has 4 divisors (see below), whose sum is σ = 21621600. Its totient is φ = 19459404.

The previous prime is 20540491. The next prime is 20540503. The reversal of 20540501 is 10504502.

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 a de Polignac number, because none of the positive numbers 2^k-20540501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20540501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540503) 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, 540521 + ... + 540558.

It is an arithmetic number, because the mean of its divisors is an integer number (5405400).

Almost surely, 2^20540501 is an apocalyptic number.

It is an amenable number.

20540501 is a deficient number, since it is larger than the sum of its proper divisors (1081099).

20540501 is a wasteful number, since it uses less digits than its factorization.

20540501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081098.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20540501 is about 4532.1629494095. The cubic root of 20540501 is about 273.8653013315.

The spelling of 20540501 in words is "twenty million, five hundred forty thousand, five hundred one".