20420078 has 32 divisors (see below), whose sum is σ = 36480000. Its totient is φ = 8390304.

The previous prime is 20420069. The next prime is 20420083. The reversal of 20420078 is 87002402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40673 + ... + 41171.

It is an arithmetic number, because the mean of its divisors is an integer number (1140000).

Almost surely, 2^20420078 is an apocalyptic number.

20420078 is a deficient number, since it is larger than the sum of its proper divisors (16059922).

20420078 is a wasteful number, since it uses less digits than its factorization.

20420078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20420078 is about 4518.8580415853. The cubic root of 20420078 is about 273.3290543980.

The spelling of 20420078 in words is "twenty million, four hundred twenty thousand, seventy-eight".