20542501 has 8 divisors (see below), whose sum is σ = 23808384. Its totient is φ = 17359440.

The previous prime is 20542499. The next prime is 20542507. The reversal of 20542501 is 10524502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20542501 - 2¹ = 20542499 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 (20542507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20170 + ... + 21163.

It is an arithmetic number, because the mean of its divisors is an integer number (2976048).

Almost surely, 2^20542501 is an apocalyptic number.

It is an amenable number.

20542501 is a deficient number, since it is larger than the sum of its proper divisors (3265883).

20542501 is an equidigital number, since it uses as much as digits as its factorization.

20542501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41411.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20542501 is about 4532.3835892387. The cubic root of 20542501 is about 273.8741896708.

The spelling of 20542501 in words is "twenty million, five hundred forty-two thousand, five hundred one".