20675545 has 16 divisors (see below), whose sum is σ = 27179712. Its totient is φ = 14973760.

The previous prime is 20675539. The next prime is 20675569. The reversal of 20675545 is 54557602.

It is not a de Polignac number, because 20675545 - 2³ = 20675537 is a prime.

It is a super-2 number, since 2×20675545² = 854956322094050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20675545.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15474 + ... + 16756.

It is an arithmetic number, because the mean of its divisors is an integer number (1698732).

Almost surely, 2^20675545 is an apocalyptic number.

It is an amenable number.

20675545 is a deficient number, since it is larger than the sum of its proper divisors (6504167).

20675545 is a wasteful number, since it uses less digits than its factorization.

20675545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592.

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 20675545 is about 4547.0369472878. The cubic root of 20675545 is about 274.4641687443.

The spelling of 20675545 in words is "twenty million, six hundred seventy-five thousand, five hundred forty-five".