20420308 has 12 divisors (see below), whose sum is σ = 36070272. Its totient is φ = 10114520.

The previous prime is 20420303. The next prime is 20420311. The reversal of 20420308 is 80302402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23428 + ... + 24283.

It is an arithmetic number, because the mean of its divisors is an integer number (3005856).

Almost surely, 2^20420308 is an apocalyptic number.

It is an amenable number.

20420308 is a deficient number, since it is larger than the sum of its proper divisors (15649964).

20420308 is a wasteful number, since it uses less digits than its factorization.

20420308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47822 (or 47820 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20420308 is about 4518.8834904211. The cubic root of 20420308 is about 273.3300806011.

The spelling of 20420308 in words is "twenty million, four hundred twenty thousand, three hundred eight".