20645544 has 32 divisors (see below), whose sum is σ = 52272000. Its totient is φ = 6794112.

The previous prime is 20645539. The next prime is 20645551. The reversal of 20645544 is 44554602.

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 7 ways as a sum of consecutive naturals, for example, 3549 + ... + 7340.

It is an arithmetic number, because the mean of its divisors is an integer number (1633500).

Almost surely, 2^20645544 is an apocalyptic number.

20645544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20645544 is an abundant number, since it is smaller than the sum of its proper divisors (31626456).

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

20645544 is a wasteful number, since it uses less digits than its factorization.

20645544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10977 (or 10973 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 20645544 is about 4543.7367881514. The cubic root of 20645544 is about 274.3313518431.

The spelling of 20645544 in words is "twenty million, six hundred forty-five thousand, five hundred forty-four".