20280471 has 4 divisors (see below), whose sum is σ = 27040632. Its totient is φ = 13520312.

The previous prime is 20280461. The next prime is 20280493. The reversal of 20280471 is 17408202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20280471 - 2¹⁴ = 20264087 is a prime.

It is a super-3 number, since 3×20280471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280401) 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, 3380076 + ... + 3380081.

It is an arithmetic number, because the mean of its divisors is an integer number (6760158).

Almost surely, 2^20280471 is an apocalyptic number.

20280471 is a deficient number, since it is larger than the sum of its proper divisors (6760161).

20280471 is an equidigital number, since it uses as much as digits as its factorization.

20280471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6760160.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20280471 is about 4503.3843939864. The cubic root of 20280471 is about 272.7047351780.

Adding to 20280471 its reverse (17408202), we get a palindrome (37688673).

The spelling of 20280471 in words is "twenty million, two hundred eighty thousand, four hundred seventy-one".