20392220 has 24 divisors (see below), whose sum is σ = 44301600. Its totient is φ = 7875392.

The previous prime is 20392201. The next prime is 20392223. The reversal of 20392220 is 2229302.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20392192 and 20392201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20392223) 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, 17000 + ... + 18159.

It is an arithmetic number, because the mean of its divisors is an integer number (1845900).

Almost surely, 2^20392220 is an apocalyptic number.

20392220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20392220 is an abundant number, since it is smaller than the sum of its proper divisors (23909380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20392220 is a wasteful number, since it uses less digits than its factorization.

20392220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35197 (or 35195 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20392220 is about 4515.7745736474. The cubic root of 20392220 is about 273.2047018520.

The spelling of 20392220 in words is "twenty million, three hundred ninety-two thousand, two hundred twenty".