20906120 has 32 divisors (see below), whose sum is σ = 47352600. Its totient is φ = 8306688.

The previous prime is 20906111. The next prime is 20906143. The reversal of 20906120 is 2160902.

It can be written as a sum of positive squares in 4 ways, for example, as 13734436 + 7171684 = 3706^2 + 2678^2 .

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 = 20906092 and 20906101.

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, 4616 + ... + 7944.

Almost surely, 2^20906120 is an apocalyptic number.

20906120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20906120 is an abundant number, since it is smaller than the sum of its proper divisors (26446480).

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

20906120 is a wasteful number, since it uses less digits than its factorization.

20906120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497 (or 3493 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20906120 is about 4572.3210735905. The cubic root of 20906120 is about 275.4806799780.

The spelling of 20906120 in words is "twenty million, nine hundred six thousand, one hundred twenty".