20280499 has 2 divisors, whose sum is σ = 20280500. Its totient is φ = 20280498.

The previous prime is 20280493. The next prime is 20280509. The reversal of 20280499 is 99408202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20280499 - 2¹⁷ = 20149427 is a prime.

It is a super-2 number, since 2×20280499² = 822597279378002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20280493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140249 + 10140250.

It is an arithmetic number, because the mean of its divisors is an integer number (10140250).

Almost surely, 2^20280499 is an apocalyptic number.

20280499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20280499 is an equidigital number, since it uses as much as digits as its factorization.

20280499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20280499 is about 4503.3875027583. The cubic root of 20280499 is about 272.7048606802.

The spelling of 20280499 in words is "twenty million, two hundred eighty thousand, four hundred ninety-nine".