20613912 has 64 divisors (see below), whose sum is σ = 56799360. Its totient is φ = 6182400.

The previous prime is 20613907. The next prime is 20613941. The reversal of 20613912 is 21931602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 29487 + ... + 30177.

It is an arithmetic number, because the mean of its divisors is an integer number (887490).

Almost surely, 2^20613912 is an apocalyptic number.

20613912 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 20613912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28399680).

20613912 is an abundant number, since it is smaller than the sum of its proper divisors (36185448).

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

20613912 is a wasteful number, since it uses less digits than its factorization.

20613912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20613912 is about 4540.2546184107. The cubic root of 20613912 is about 274.1911749457.

The spelling of 20613912 in words is "twenty million, six hundred thirteen thousand, nine hundred twelve".