20001250501 has 4 divisors (see below), whose sum is σ = 20870870112. Its totient is φ = 19131630892.

The previous prime is 20001250453. The next prime is 20001250513. The reversal of 20001250501 is 10505210002.

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-20001250501 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 (20001250001) 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, 434809771 + ... + 434809816.

It is an arithmetic number, because the mean of its divisors is an integer number (5217717528).

Almost surely, 2^20001250501 is an apocalyptic number.

It is an amenable number.

20001250501 is a deficient number, since it is larger than the sum of its proper divisors (869619611).

20001250501 is an equidigital number, since it uses as much as digits as its factorization.

20001250501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869619610.

The product of its (nonzero) digits is 100, while the sum is 16.

Adding to 20001250501 its reverse (10505210002), we get a palindrome (30506460503).

The spelling of 20001250501 in words is "twenty billion, one million, two hundred fifty thousand, five hundred one".