20490755 has 8 divisors (see below), whose sum is σ = 24657072. Its totient is φ = 16347168.

The previous prime is 20490749. The next prime is 20490761. The reversal of 20490755 is 55709402.

It is an interprime number because it is at equal distance from previous prime (20490749) and next prime (20490761).

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 20490755 - 2¹⁴ = 20474371 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3629 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (3082134).

Almost surely, 2^20490755 is an apocalyptic number.

20490755 is a deficient number, since it is larger than the sum of its proper divisors (4166317).

20490755 is a wasteful number, since it uses less digits than its factorization.

20490755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11365.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20490755 is about 4526.6715144795. The cubic root of 20490755 is about 273.6440357729.

The spelling of 20490755 in words is "twenty million, four hundred ninety thousand, seven hundred fifty-five".