20709612 has 144 divisors (see below), whose sum is σ = 67651584. Its totient is φ = 5184000.

The previous prime is 20709607. The next prime is 20709629. The reversal of 20709612 is 21690702.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85812 + ... + 86052.

Almost surely, 2^20709612 is an apocalyptic number.

20709612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20709612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33825792).

20709612 is an abundant number, since it is smaller than the sum of its proper divisors (46941972).

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

20709612 is a wasteful number, since it uses less digits than its factorization.

20709612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20709612 is about 4550.7814713519. The cubic root of 20709612 is about 274.6148304741.

It can be divided in two parts, 20709 and 612, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20709612 in words is "twenty million, seven hundred nine thousand, six hundred twelve".