20267280 has 160 divisors (see below), whose sum is σ = 76245120. Its totient is φ = 4907520.

The previous prime is 20267279. The next prime is 20267297. The reversal of 20267280 is 8276202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23334 + ... + 24186.

It is an arithmetic number, because the mean of its divisors is an integer number (476532).

Almost surely, 2^20267280 is an apocalyptic number.

20267280 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 20267280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38122560).

20267280 is an abundant number, since it is smaller than the sum of its proper divisors (55977840).

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

20267280 is a wasteful number, since it uses less digits than its factorization.

20267280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20267280 is about 4501.9195905747. The cubic root of 20267280 is about 272.6455973608.

The spelling of 20267280 in words is "twenty million, two hundred sixty-seven thousand, two hundred eighty".