20420379 has 24 divisors (see below), whose sum is σ = 34875360. Its totient is φ = 11265408.

The previous prime is 20420377. The next prime is 20420443. The reversal of 20420379 is 97302402.

It is not a de Polignac number, because 20420379 - 2¹ = 20420377 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 3762 + ... + 7415.

It is an arithmetic number, because the mean of its divisors is an integer number (1453140).

Almost surely, 2^20420379 is an apocalyptic number.

20420379 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20420379 is a deficient number, since it is larger than the sum of its proper divisors (14454981).

20420379 is a wasteful number, since it uses less digits than its factorization.

20420379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11219 (or 11216 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20420379 is about 4518.8913463371. The cubic root of 20420379 is about 273.3303973840.

The spelling of 20420379 in words is "twenty million, four hundred twenty thousand, three hundred seventy-nine".