20280454 has 8 divisors (see below), whose sum is σ = 31469760. Its totient is φ = 9790536.

The previous prime is 20280451. The next prime is 20280461. The reversal of 20280454 is 45408202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20280454² = 822593628892232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174774 + ... + 174889.

It is an arithmetic number, because the mean of its divisors is an integer number (3933720).

Almost surely, 2^20280454 is an apocalyptic number.

20280454 is a deficient number, since it is larger than the sum of its proper divisors (11189306).

20280454 is a wasteful number, since it uses less digits than its factorization.

20280454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349694.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 20280454 is about 4503.3825065166. The cubic root of 20280454 is about 272.7046589802.

Adding to 20280454 its reverse (45408202), we get a palindrome (65688656).

It can be divided in two parts, 202 and 80454, that added together give a square (80656 = 284²).

The spelling of 20280454 in words is "twenty million, two hundred eighty thousand, four hundred fifty-four".