20523646 has 16 divisors (see below), whose sum is σ = 36168048. Its totient is φ = 8611200.

The previous prime is 20523623. The next prime is 20523649. The reversal of 20523646 is 64632502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523649) 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, 35595 + ... + 36166.

It is an arithmetic number, because the mean of its divisors is an integer number (2260503).

Almost surely, 2^20523646 is an apocalyptic number.

20523646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20523646 is a deficient number, since it is larger than the sum of its proper divisors (15644402).

20523646 is a wasteful number, since it uses less digits than its factorization.

20523646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71787.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20523646 is about 4530.3030803689. The cubic root of 20523646 is about 273.7903719222.

The spelling of 20523646 in words is "twenty million, five hundred twenty-three thousand, six hundred forty-six".