20274280 has 64 divisors (see below), whose sum is σ = 49674240. Its totient is φ = 7402752.

The previous prime is 20274271. The next prime is 20274283. The reversal of 20274280 is 8247202.

It is a super-2 number, since 2×20274280² = 822092859036800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20274283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65887 + ... + 66193.

It is an arithmetic number, because the mean of its divisors is an integer number (776160).

Almost surely, 2^20274280 is an apocalyptic number.

20274280 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 20274280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24837120).

20274280 is an abundant number, since it is smaller than the sum of its proper divisors (29399960).

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

20274280 is a wasteful number, since it uses less digits than its factorization.

20274280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 20274280 is about 4502.6969695950. The cubic root of 20274280 is about 272.6769829159.

It can be divided in two parts, 202742 and 80, that multiplied together give a triangular number (16219360 = T₅₆₉₅).

The spelling of 20274280 in words is "twenty million, two hundred seventy-four thousand, two hundred eighty".