20745612 has 96 divisors (see below), whose sum is σ = 56663040. Its totient is φ = 6557760.

The previous prime is 20745583. The next prime is 20745623. The reversal of 20745612 is 21654702.

20745612 is a `hidden beast` number, since 2 + 0 + 7 + 45 + 612 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309603 + ... + 309669.

It is an arithmetic number, because the mean of its divisors is an integer number (590240).

Almost surely, 2^20745612 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 20745612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28331520).

20745612 is an abundant number, since it is smaller than the sum of its proper divisors (35917428).

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

20745612 is a wasteful number, since it uses less digits than its factorization.

20745612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20745612 is about 4554.7351185332. The cubic root of 20745612 is about 274.7738614752.

The spelling of 20745612 in words is "twenty million, seven hundred forty-five thousand, six hundred twelve".