20520488 has 8 divisors (see below), whose sum is σ = 38475930. Its totient is φ = 10260240.

The previous prime is 20520433. The next prime is 20520499. The reversal of 20520488 is 88402502.

It can be written as a sum of positive squares in only one way, i.e., 16826404 + 3694084 = 4102^2 + 1922^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20520488.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282523 + ... + 1282538.

Almost surely, 2^20520488 is an apocalyptic number.

It is an amenable number.

20520488 is a deficient number, since it is larger than the sum of its proper divisors (17955442).

20520488 is a wasteful number, since it uses less digits than its factorization.

20520488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565067 (or 2565063 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 20520488 is about 4529.9545251581. The cubic root of 20520488 is about 273.7763283755.

The spelling of 20520488 in words is "twenty million, five hundred twenty thousand, four hundred eighty-eight".