20508542 has 12 divisors (see below), whose sum is σ = 31054200. Its totient is φ = 10157796.

The previous prime is 20508541. The next prime is 20508599. The reversal of 20508542 is 24580502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90233 + ... + 90459.

It is an arithmetic number, because the mean of its divisors is an integer number (2587850).

Almost surely, 2^20508542 is an apocalyptic number.

20508542 is a deficient number, since it is larger than the sum of its proper divisors (10545658).

20508542 is an equidigital number, since it uses as much as digits as its factorization.

20508542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 20508542 is about 4528.6357769200. The cubic root of 20508542 is about 273.7231917758.

The spelling of 20508542 in words is "twenty million, five hundred eight thousand, five hundred forty-two".