20397278 has 8 divisors (see below), whose sum is σ = 33377400. Its totient is φ = 9271480.

The previous prime is 20397269. The next prime is 20397313. The reversal of 20397278 is 87279302.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463553 + ... + 463596.

It is an arithmetic number, because the mean of its divisors is an integer number (4172175).

Almost surely, 2^20397278 is an apocalyptic number.

20397278 is a deficient number, since it is larger than the sum of its proper divisors (12980122).

20397278 is a wasteful number, since it uses less digits than its factorization.

20397278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927162.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 20397278 is about 4516.3345757373. The cubic root of 20397278 is about 273.2272881643.

The spelling of 20397278 in words is "twenty million, three hundred ninety-seven thousand, two hundred seventy-eight".