20505952 has 24 divisors (see below), whose sum is σ = 40748400. Its totient is φ = 10157184.

The previous prime is 20505941. The next prime is 20505983. The reversal of 20505952 is 25950502.

It is a self number, because there is not a number n which added to its sum of digits gives 20505952.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 549 + ... + 6427.

It is an arithmetic number, because the mean of its divisors is an integer number (1697850).

Almost surely, 2^20505952 is an apocalyptic number.

It is an amenable number.

20505952 is a deficient number, since it is larger than the sum of its proper divisors (20242448).

20505952 is a wasteful number, since it uses less digits than its factorization.

20505952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998 (or 5990 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 20505952 is about 4528.3498098093. The cubic root of 20505952 is about 273.7116685625.

The spelling of 20505952 in words is "twenty million, five hundred five thousand, nine hundred fifty-two".