20545508 has 12 divisors (see below), whose sum is σ = 36926652. Its totient is φ = 9995040.

The previous prime is 20545493. The next prime is 20545531. The reversal of 20545508 is 80554502.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 10099684 = 3232^2 + 3178^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69263 + ... + 69558.

It is an arithmetic number, because the mean of its divisors is an integer number (3077221).

Almost surely, 2^20545508 is an apocalyptic number.

It is an amenable number.

20545508 is a deficient number, since it is larger than the sum of its proper divisors (16381144).

20545508 is a wasteful number, since it uses less digits than its factorization.

20545508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138862 (or 138860 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 20545508 is about 4532.7153010089. The cubic root of 20545508 is about 273.8875522033.

The spelling of 20545508 in words is "twenty million, five hundred forty-five thousand, five hundred eight".