20628523 has 4 divisors (see below), whose sum is σ = 20674120. Its totient is φ = 20582928.

The previous prime is 20628521. The next prime is 20628529. The reversal of 20628523 is 32582602.

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

It is a cyclic number.

It is not a de Polignac number, because 20628523 - 2¹ = 20628521 is a prime.

It is a super-2 number, since 2×20628523² = 851071922323058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20628491 and 20628500.

It is not an unprimeable number, because it can be changed into a prime (20628521) 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, 22113 + ... + 23026.

It is an arithmetic number, because the mean of its divisors is an integer number (5168530).

Almost surely, 2^20628523 is an apocalyptic number.

20628523 is a deficient number, since it is larger than the sum of its proper divisors (45597).

20628523 is an equidigital number, since it uses as much as digits as its factorization.

20628523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45596.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20628523 is about 4541.8633841189. The cubic root of 20628523 is about 274.2559412567.

It can be divided in two parts, 2062 and 8523, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 20628523 in words is "twenty million, six hundred twenty-eight thousand, five hundred twenty-three".