20420278 has 16 divisors (see below), whose sum is σ = 31584960. Its totient is φ = 9896256.

The previous prime is 20420243. The next prime is 20420287. The reversal of 20420278 is 87202402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9250 + ... + 11242.

It is an arithmetic number, because the mean of its divisors is an integer number (1974060).

Almost surely, 2^20420278 is an apocalyptic number.

20420278 is a deficient number, since it is larger than the sum of its proper divisors (11164682).

20420278 is a wasteful number, since it uses less digits than its factorization.

20420278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 20420278 is about 4518.8801710158. The cubic root of 20420278 is about 273.3299467490.

The spelling of 20420278 in words is "twenty million, four hundred twenty thousand, two hundred seventy-eight".