20523123 has 12 divisors (see below), whose sum is σ = 30446208. Its totient is φ = 13312080.

The previous prime is 20523119. The next prime is 20523127. The reversal of 20523123 is 32132502.

20523123 is a `hidden beast` number, since 20 + 523 + 123 = 666.

It is an interprime number because it is at equal distance from previous prime (20523119) and next prime (20523127).

It is not a de Polignac number, because 20523123 - 2² = 20523119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20523096 and 20523105.

It is not an unprimeable number, because it can be changed into a prime (20523127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30483 + ... + 31148.

It is an arithmetic number, because the mean of its divisors is an integer number (2537184).

Almost surely, 2^20523123 is an apocalyptic number.

20523123 is a deficient number, since it is larger than the sum of its proper divisors (9923085).

20523123 is a wasteful number, since it uses less digits than its factorization.

20523123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61674 (or 61671 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20523123 is about 4530.2453575938. The cubic root of 20523123 is about 273.7880462539.

Adding to 20523123 its reverse (32132502), we get a palindrome (52655625).

The spelling of 20523123 in words is "twenty million, five hundred twenty-three thousand, one hundred twenty-three".