20280474 has 12 divisors (see below), whose sum is σ = 43941066. Its totient is φ = 6760152.

The previous prime is 20280461. The next prime is 20280493. The reversal of 20280474 is 47408202.

It can be written as a sum of positive squares in only one way, i.e., 19740249 + 540225 = 4443^2 + 735^2 .

It is a super-2 number, since 2×20280474² = 822595251329352, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 563329 + ... + 563364.

Almost surely, 2^20280474 is an apocalyptic number.

20280474 is an abundant number, since it is smaller than the sum of its proper divisors (23660592).

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

20280474 is a wasteful number, since it uses less digits than its factorization.

20280474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126701 (or 1126698 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20280474 is about 4503.3847270692. The cubic root of 20280474 is about 272.7047486247.

Adding to 20280474 its reverse (47408202), we get a palindrome (67688676).

The spelling of 20280474 in words is "twenty million, two hundred eighty thousand, four hundred seventy-four".