20807712 has 48 divisors (see below), whose sum is σ = 60691680. Its totient is φ = 6935616.

The previous prime is 20807693. The next prime is 20807713. The reversal of 20807712 is 21770802.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20807713) 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, 11178 + ... + 12905.

It is an arithmetic number, because the mean of its divisors is an integer number (1264410).

Almost surely, 2^20807712 is an apocalyptic number.

It is an amenable number.

20807712 is an abundant number, since it is smaller than the sum of its proper divisors (39883968).

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

20807712 is a wasteful number, since it uses less digits than its factorization.

20807712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24102 (or 24088 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20807712 is about 4561.5471059718. The cubic root of 20807712 is about 275.0477580968.

The spelling of 20807712 in words is "twenty million, eight hundred seven thousand, seven hundred twelve".