20278899 has 12 divisors (see below), whose sum is σ = 29341000. Its totient is φ = 13496544.

The previous prime is 20278897. The next prime is 20278903. The reversal of 20278899 is 99887202.

It is not a de Polignac number, because 20278899 - 2¹ = 20278897 is a prime.

It is a super-2 number, since 2×20278899² = 822467489304402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20278897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5127 + ... + 8175.

Almost surely, 2^20278899 is an apocalyptic number.

20278899 is a deficient number, since it is larger than the sum of its proper divisors (9062101).

20278899 is a wasteful number, since it uses less digits than its factorization.

20278899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794 (or 3791 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 20278899 is about 4503.2098552033. The cubic root of 20278899 is about 272.6976889426.

The spelling of 20278899 in words is "twenty million, two hundred seventy-eight thousand, eight hundred ninety-nine".