20520575 has 12 divisors (see below), whose sum is σ = 25550448. Its totient is φ = 16348800.

The previous prime is 20520571. The next prime is 20520629. The reversal of 20520575 is 57502502.

It is not a de Polignac number, because 20520575 - 2² = 20520571 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 (20520571) 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, 5015 + ... + 8135.

It is an arithmetic number, because the mean of its divisors is an integer number (2129204).

Almost surely, 2^20520575 is an apocalyptic number.

20520575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20520575 is a deficient number, since it is larger than the sum of its proper divisors (5029873).

20520575 is a wasteful number, since it uses less digits than its factorization.

20520575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394 (or 3389 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 26.

The square root of 20520575 is about 4529.9641278933. The cubic root of 20520575 is about 273.7767152816.

The spelling of 20520575 in words is "twenty million, five hundred twenty thousand, five hundred seventy-five".