20206501 has 4 divisors (see below), whose sum is σ = 23093152. Its totient is φ = 17319852.

The previous prime is 20206493. The next prime is 20206577. The reversal of 20206501 is 10560202.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 10560202 = 2 ⋅5280101.

It is a cyclic number.

It is not a de Polignac number, because 20206501 - 2³ = 20206493 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 (20206801) 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, 1443315 + ... + 1443328.

It is an arithmetic number, because the mean of its divisors is an integer number (5773288).

Almost surely, 2^20206501 is an apocalyptic number.

It is an amenable number.

20206501 is a deficient number, since it is larger than the sum of its proper divisors (2886651).

20206501 is an equidigital number, since it uses as much as digits as its factorization.

20206501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2886650.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20206501 is about 4495.1641794266. The cubic root of 20206501 is about 272.3727812862.

Adding to 20206501 its reverse (10560202), we get a palindrome (30766703).

The spelling of 20206501 in words is "twenty million, two hundred six thousand, five hundred one".