20102501 has 4 divisors (see below), whose sum is σ = 20114400. Its totient is φ = 20090604.

The previous prime is 20102497. The next prime is 20102503. The reversal of 20102501 is 10520102.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10520102 = 2 ⋅5260051.

It is a cyclic number.

It is not a de Polignac number, because 20102501 - 2² = 20102497 is a prime.

It is a super-2 number, since 2×20102501² = 808221092910002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102503) 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, 2891 + ... + 6968.

It is an arithmetic number, because the mean of its divisors is an integer number (5028600).

Almost surely, 2^20102501 is an apocalyptic number.

It is an amenable number.

20102501 is a deficient number, since it is larger than the sum of its proper divisors (11899).

20102501 is an equidigital number, since it uses as much as digits as its factorization.

20102501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11898.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 20102501 is about 4483.5812694764. The cubic root of 20102501 is about 271.9046892491.

Adding to 20102501 its reverse (10520102), we get a palindrome (30622603).

The spelling of 20102501 in words is "twenty million, one hundred two thousand, five hundred one".