20280451 has 2 divisors, whose sum is σ = 20280452. Its totient is φ = 20280450.

The previous prime is 20280443. The next prime is 20280461. The reversal of 20280451 is 15408202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20280451 - 2³ = 20280443 is a prime.

It is a super-2 number, since 2×20280451² = 822593385526802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20280401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140225 + 10140226.

It is an arithmetic number, because the mean of its divisors is an integer number (10140226).

Almost surely, 2^20280451 is an apocalyptic number.

20280451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280451 is an equidigital number, since it uses as much as digits as its factorization.

20280451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20280451 is about 4503.3821734337. The cubic root of 20280451 is about 272.7046455335.

Adding to 20280451 its reverse (15408202), we get a palindrome (35688653).

The spelling of 20280451 in words is "twenty million, two hundred eighty thousand, four hundred fifty-one".