20534555 has 16 divisors (see below), whose sum is σ = 26936064. Its totient is φ = 14960640.

The previous prime is 20534543. The next prime is 20534567. The reversal of 20534555 is 55543502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20534543) and next prime (20534567).

It is not a de Polignac number, because 20534555 - 2⁴ = 20534539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1262 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (1683504).

Almost surely, 2^20534555 is an apocalyptic number.

20534555 is a deficient number, since it is larger than the sum of its proper divisors (6401509).

20534555 is a wasteful number, since it uses less digits than its factorization.

20534555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7846.

The product of its (nonzero) digits is 15000, while the sum is 29.

The square root of 20534555 is about 4531.5069237506. The cubic root of 20534555 is about 273.8388728909.

The spelling of 20534555 in words is "twenty million, five hundred thirty-four thousand, five hundred fifty-five".