20442501 has 24 divisors (see below), whose sum is σ = 30572256. Its totient is φ = 13154400.

The previous prime is 20442479. The next prime is 20442511. The reversal of 20442501 is 10524402.

It is not a de Polignac number, because 20442501 - 2¹⁵ = 20409733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38826 + ... + 39348.

It is an arithmetic number, because the mean of its divisors is an integer number (1273844).

Almost surely, 2^20442501 is an apocalyptic number.

It is an amenable number.

20442501 is a deficient number, since it is larger than the sum of its proper divisors (10129755).

20442501 is a wasteful number, since it uses less digits than its factorization.

20442501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20442501 is about 4521.3384080380. The cubic root of 20442501 is about 273.4290640619.

Adding to 20442501 its reverse (10524402), we get a palindrome (30966903).

The spelling of 20442501 in words is "twenty million, four hundred forty-two thousand, five hundred one".