20473220 has 24 divisors (see below), whose sum is σ = 44864064. Its totient is φ = 7833056.

The previous prime is 20473213. The next prime is 20473223. The reversal of 20473220 is 2237402.

It is a happy number.

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 = 20473192 and 20473201.

It is not an unprimeable number, because it can be changed into a prime (20473223) 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, 21794 + ... + 22713.

It is an arithmetic number, because the mean of its divisors is an integer number (1869336).

Almost surely, 2^20473220 is an apocalyptic number.

20473220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20473220 is an abundant number, since it is smaller than the sum of its proper divisors (24390844).

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

20473220 is a wasteful number, since it uses less digits than its factorization.

20473220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44539 (or 44537 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 20473220 is about 4524.7342463398. The cubic root of 20473220 is about 273.5659563731.

The spelling of 20473220 in words is "twenty million, four hundred seventy-three thousand, two hundred twenty".