20372501 has 4 divisors (see below), whose sum is σ = 20478252. Its totient is φ = 20266752.

The previous prime is 20372491. The next prime is 20372507. The reversal of 20372501 is 10527302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9449476 + 10923025 = 3074^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 20372501 - 2¹⁴ = 20356117 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 (20372507) 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, 52586 + ... + 52971.

It is an arithmetic number, because the mean of its divisors is an integer number (5119563).

Almost surely, 2^20372501 is an apocalyptic number.

It is an amenable number.

20372501 is a deficient number, since it is larger than the sum of its proper divisors (105751).

20372501 is a wasteful number, since it uses less digits than its factorization.

20372501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105750.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20372501 is about 4513.5906992106. The cubic root of 20372501 is about 273.1166117056.

Adding to 20372501 its reverse (10527302), we get a palindrome (30899803).

The spelling of 20372501 in words is "twenty million, three hundred seventy-two thousand, five hundred one".