20544657 has 32 divisors (see below), whose sum is σ = 32554752. Its totient is φ = 11280384.

The previous prime is 20544611. The next prime is 20544659. The reversal of 20544657 is 75644502.

It is not a de Polignac number, because 20544657 - 2¹² = 20540561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20544659) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 106353 + ... + 106545.

It is an arithmetic number, because the mean of its divisors is an integer number (1017336).

Almost surely, 2^20544657 is an apocalyptic number.

It is an amenable number.

20544657 is a deficient number, since it is larger than the sum of its proper divisors (12010095).

20544657 is a wasteful number, since it uses less digits than its factorization.

20544657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377.

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 20544657 is about 4532.6214269449. The cubic root of 20544657 is about 273.8837706544.

The spelling of 20544657 in words is "twenty million, five hundred forty-four thousand, six hundred fifty-seven".