20523146 has 16 divisors (see below), whose sum is σ = 35247744. Its totient is φ = 8779344.

The previous prime is 20523143. The next prime is 20523149. The reversal of 20523146 is 64132502.

It is an interprime number because it is at equal distance from previous prime (20523143) and next prime (20523149).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20523143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9416 + ... + 11388.

It is an arithmetic number, because the mean of its divisors is an integer number (2202984).

Almost surely, 2^20523146 is an apocalyptic number.

20523146 is a deficient number, since it is larger than the sum of its proper divisors (14724598).

20523146 is a wasteful number, since it uses less digits than its factorization.

20523146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20523146 is about 4530.2478960869. The cubic root of 20523146 is about 273.7881485308.

Adding to 20523146 its reverse (64132502), we get a palindrome (84655648).

The spelling of 20523146 in words is "twenty million, five hundred twenty-three thousand, one hundred forty-six".