20271420 has 72 divisors (see below), whose sum is σ = 66227616. Its totient is φ = 4989312.

The previous prime is 20271401. The next prime is 20271421. The reversal of 20271420 is 2417202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20271393 and 20271402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20271421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1992 + ... + 6671.

It is an arithmetic number, because the mean of its divisors is an integer number (919828).

Almost surely, 2^20271420 is an apocalyptic number.

20271420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20271420 is an abundant number, since it is smaller than the sum of its proper divisors (45956196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20271420 is a wasteful number, since it uses less digits than its factorization.

20271420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8691 (or 8686 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 20271420 is about 4502.3793709549. The cubic root of 20271420 is about 272.6641605478.

Adding to 20271420 its reverse (2417202), we get a palindrome (22688622).

The spelling of 20271420 in words is "twenty million, two hundred seventy-one thousand, four hundred twenty".