20551545 has 48 divisors (see below), whose sum is σ = 41513472. Its totient is φ = 9210240.

The previous prime is 20551523. The next prime is 20551561. The reversal of 20551545 is 54515502.

It is not a de Polignac number, because 20551545 - 2⁷ = 20551417 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16080 + ... + 17310.

It is an arithmetic number, because the mean of its divisors is an integer number (864864).

Almost surely, 2^20551545 is an apocalyptic number.

It is an amenable number.

20551545 is an abundant number, since it is smaller than the sum of its proper divisors (20961927).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20551545 is a wasteful number, since it uses less digits than its factorization.

20551545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302 (or 1299 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 20551545 is about 4533.3811884729. The cubic root of 20551545 is about 273.9143755399.

It can be divided in two parts, 2055 and 1545, that added together give a square (3600 = 60²).

The spelling of 20551545 in words is "twenty million, five hundred fifty-one thousand, five hundred forty-five".