20954487 has 8 divisors (see below), whose sum is σ = 28196080. Its totient is φ = 13841280.

The previous prime is 20954467. The next prime is 20954497. The reversal of 20954487 is 78445902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20954487 - 2¹⁰ = 20953463 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 (20954447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31714 + ... + 32367.

It is an arithmetic number, because the mean of its divisors is an integer number (3524510).

Almost surely, 2^20954487 is an apocalyptic number.

20954487 is a deficient number, since it is larger than the sum of its proper divisors (7241593).

20954487 is a wasteful number, since it uses less digits than its factorization.

20954487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64193.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 20954487 is about 4577.6071259993. The cubic root of 20954487 is about 275.6929609103.

The spelling of 20954487 in words is "twenty million, nine hundred fifty-four thousand, four hundred eighty-seven".