20475220 has 24 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 8085792.

The previous prime is 20475197. The next prime is 20475253. The reversal of 20475220 is 2257402.

It is a junction number, because it is equal to n+sod(n) for n = 20475191 and 20475200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4900 + ... + 8059.

It is an arithmetic number, because the mean of its divisors is an integer number (1814400).

Almost surely, 2^20475220 is an apocalyptic number.

20475220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20475220 is an abundant number, since it is smaller than the sum of its proper divisors (23070380).

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

20475220 is a wasteful number, since it uses less digits than its factorization.

20475220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13047 (or 13045 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20475220 is about 4524.9552483975. The cubic root of 20475220 is about 273.5748641740.

The spelling of 20475220 in words is "twenty million, four hundred seventy-five thousand, two hundred twenty".