20278407 has 8 divisors (see below), whose sum is σ = 27244800. Its totient is φ = 13415480.

The previous prime is 20278403. The next prime is 20278409. The reversal of 20278407 is 70487202.

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

It is a cyclic number.

It is not a de Polignac number, because 20278407 - 2² = 20278403 is a prime.

It is a super-2 number, since 2×20278407² = 822427580915298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20278403) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 25407 + ... + 26192.

It is an arithmetic number, because the mean of its divisors is an integer number (3405600).

Almost surely, 2^20278407 is an apocalyptic number.

20278407 is a deficient number, since it is larger than the sum of its proper divisors (6966393).

20278407 is a wasteful number, since it uses less digits than its factorization.

20278407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51733.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20278407 is about 4503.1552271713. The cubic root of 20278407 is about 272.6954835574.

The spelling of 20278407 in words is "twenty million, two hundred seventy-eight thousand, four hundred seven".