20720278 has 16 divisors (see below), whose sum is σ = 31680000. Its totient is φ = 10162152.

The previous prime is 20720261. The next prime is 20720299. The reversal of 20720278 is 87202702.

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, 31113 + ... + 31771.

It is an arithmetic number, because the mean of its divisors is an integer number (1980000).

Almost surely, 2^20720278 is an apocalyptic number.

20720278 is a deficient number, since it is larger than the sum of its proper divisors (10959722).

20720278 is a wasteful number, since it uses less digits than its factorization.

20720278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20720278 is about 4551.9532071409. The cubic root of 20720278 is about 274.6619670256.

The spelling of 20720278 in words is "twenty million, seven hundred twenty thousand, two hundred seventy-eight".