20480280 has 32 divisors (see below), whose sum is σ = 61441200. Its totient is φ = 5461376.

The previous prime is 20480269. The next prime is 20480321. The reversal of 20480280 is 8208402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20480280.

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, 85215 + ... + 85454.

Almost surely, 2^20480280 is an apocalyptic number.

20480280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20480280 is an abundant number, since it is smaller than the sum of its proper divisors (40960920).

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

20480280 is a wasteful number, since it uses less digits than its factorization.

20480280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170683 (or 170679 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 20480280 is about 4525.5143354098. The cubic root of 20480280 is about 273.5973983201.

Adding to 20480280 its reverse (8208402), we get a palindrome (28688682).

The spelling of 20480280 in words is "twenty million, four hundred eighty thousand, two hundred eighty".