20523101 has 4 divisors (see below), whose sum is σ = 20599104. Its totient is φ = 20447100.

The previous prime is 20523089. The next prime is 20523103. The reversal of 20523101 is 10132502.

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: 10132502 = 2 ⋅5066251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523101 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 (20523103) 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, 37595 + ... + 38136.

It is an arithmetic number, because the mean of its divisors is an integer number (5149776).

Almost surely, 2^20523101 is an apocalyptic number.

It is an amenable number.

20523101 is a deficient number, since it is larger than the sum of its proper divisors (76003).

20523101 is an equidigital number, since it uses as much as digits as its factorization.

20523101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76002.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20523101 is about 4530.2429294686. The cubic root of 20523101 is about 273.7879484238.

Adding to 20523101 its reverse (10132502), we get a palindrome (30655603).

The spelling of 20523101 in words is "twenty million, five hundred twenty-three thousand, one hundred one".