20707420 has 24 divisors (see below), whose sum is σ = 44662464. Its totient is φ = 8058816.

The previous prime is 20707403. The next prime is 20707433. The reversal of 20707420 is 2470702.

It is a junction number, because it is equal to n+sod(n) for n = 20707391 and 20707400.

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, 13252 + ... + 14731.

It is an arithmetic number, because the mean of its divisors is an integer number (1860936).

Almost surely, 2^20707420 is an apocalyptic number.

20707420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20707420 is an abundant number, since it is smaller than the sum of its proper divisors (23955044).

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

20707420 is a wasteful number, since it uses less digits than its factorization.

20707420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28029 (or 28027 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 20707420 is about 4550.5406272222. The cubic root of 20707420 is about 274.6051413026.

The spelling of 20707420 in words is "twenty million, seven hundred seven thousand, four hundred twenty".