20755487 has 8 divisors (see below), whose sum is σ = 22016736. Its totient is φ = 19498752.

The previous prime is 20755463. The next prime is 20755507. The reversal of 20755487 is 78455702.

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

It is a cyclic number.

It is not a de Polignac number, because 20755487 - 2¹² = 20751391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20755487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20755417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15278 + ... + 16580.

It is an arithmetic number, because the mean of its divisors is an integer number (2752092).

Almost surely, 2^20755487 is an apocalyptic number.

20755487 is a deficient number, since it is larger than the sum of its proper divisors (1261249).

20755487 is a wasteful number, since it uses less digits than its factorization.

20755487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257.

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 20755487 is about 4555.8190262564. The cubic root of 20755487 is about 274.8174524037.

The spelling of 20755487 in words is "twenty million, seven hundred fifty-five thousand, four hundred eighty-seven".