20071280 has 40 divisors (see below), whose sum is σ = 47206800. Its totient is φ = 7935488.

The previous prime is 20071273. The next prime is 20071297. The reversal of 20071280 is 8217002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent 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, 5711 + ... + 8529.

It is an arithmetic number, because the mean of its divisors is an integer number (1180170).

Almost surely, 2^20071280 is an apocalyptic number.

20071280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20071280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23603400).

20071280 is an abundant number, since it is smaller than the sum of its proper divisors (27135520).

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

20071280 is a wasteful number, since it uses less digits than its factorization.

20071280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921 (or 2915 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 20071280 is about 4480.0982132092. The cubic root of 20071280 is about 271.7638521314.

Adding to 20071280 its reverse (8217002), we get a palindrome (28288282).

The spelling of 20071280 in words is "twenty million, seventy-one thousand, two hundred eighty".