20959549 has 6 divisors (see below), whose sum is σ = 22696026. Its totient is φ = 19347120.

The previous prime is 20959537. The next prime is 20959567. The reversal of 20959549 is 94595902.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1643524 + 19316025 = 1282^2 + 4395^2 .

It is not a de Polignac number, because 20959549 - 2⁵ = 20959517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20959349) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61842 + ... + 62179.

It is an arithmetic number, because the mean of its divisors is an integer number (3782671).

Almost surely, 2^20959549 is an apocalyptic number.

It is an amenable number.

20959549 is a deficient number, since it is larger than the sum of its proper divisors (1736477).

20959549 is a wasteful number, since it uses less digits than its factorization.

20959549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124047 (or 124034 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 20959549 is about 4578.1600015727. The cubic root of 20959549 is about 275.7151589469.

The spelling of 20959549 in words is "twenty million, nine hundred fifty-nine thousand, five hundred forty-nine".