20907712 has 84 divisors (see below), whose sum is σ = 49514760. Its totient is φ = 8730624.

The previous prime is 20907709. The next prime is 20907727. The reversal of 20907712 is 21770902.

It is a happy number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184968 + ... + 185080.

Almost surely, 2^20907712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20907712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24757380).

20907712 is an abundant number, since it is smaller than the sum of its proper divisors (28607048).

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

20907712 is a wasteful number, since it uses less digits than its factorization.

20907712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20907712 is about 4572.4951612878. The cubic root of 20907712 is about 275.4876724139.

The spelling of 20907712 in words is "twenty million, nine hundred seven thousand, seven hundred twelve".