20613012 has 48 divisors (see below), whose sum is σ = 55276032. Its totient is φ = 5856480.

The previous prime is 20612957. The next prime is 20613029. The reversal of 20613012 is 21031602.

It is a junction number, because it is equal to n+sod(n) for n = 20612982 and 20613000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17143 + ... + 18305.

It is an arithmetic number, because the mean of its divisors is an integer number (1151584).

Almost surely, 2^20613012 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 20613012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27638016).

20613012 is an abundant number, since it is smaller than the sum of its proper divisors (34663020).

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

20613012 is a wasteful number, since it uses less digits than its factorization.

20613012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388 (or 1386 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20613012 is about 4540.1555039448. The cubic root of 20613012 is about 274.1871845071.

Adding to 20613012 its reverse (21031602), we get a palindrome (41644614).

The spelling of 20613012 in words is "twenty million, six hundred thirteen thousand, twelve".