20420378 has 16 divisors (see below), whose sum is σ = 34231680. Its totient is φ = 9055200.

The previous prime is 20420377. The next prime is 20420443. The reversal of 20420378 is 87302402.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20420371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10418 + ... + 12221.

It is an arithmetic number, because the mean of its divisors is an integer number (2139480).

Almost surely, 2^20420378 is an apocalyptic number.

20420378 is a deficient number, since it is larger than the sum of its proper divisors (13811302).

20420378 is a wasteful number, since it uses less digits than its factorization.

20420378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22693.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20420378 is about 4518.8912356905. The cubic root of 20420378 is about 273.3303929223.

The spelling of 20420378 in words is "twenty million, four hundred twenty thousand, three hundred seventy-eight".