20755481 has 4 divisors (see below), whose sum is σ = 20803200. Its totient is φ = 20707764.

The previous prime is 20755463. The next prime is 20755507. The reversal of 20755481 is 18455702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18455702 = 2 ⋅9227851.

It is a cyclic number.

It is not a de Polignac number, because 20755481 - 2⁶ = 20755417 is a prime.

It is a super-2 number, since 2×20755481² = 861579983082722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20755411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23201 + ... + 24078.

It is an arithmetic number, because the mean of its divisors is an integer number (5200800).

Almost surely, 2^20755481 is an apocalyptic number.

It is an amenable number.

20755481 is a deficient number, since it is larger than the sum of its proper divisors (47719).

20755481 is an equidigital number, since it uses as much as digits as its factorization.

20755481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47718.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 20755481 is about 4555.8183677579. The cubic root of 20755481 is about 274.8174259223.

The spelling of 20755481 in words is "twenty million, seven hundred fifty-five thousand, four hundred eighty-one".