20392320 has 256 divisors, whose sum is σ = 75398400. Its totient is φ = 4644864.

The previous prime is 20392297. The next prime is 20392343. The reversal of 20392320 is 2329302.

It is an interprime number because it is at equal distance from previous prime (20392297) and next prime (20392343).

It is a congruent number.

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, 474219 + ... + 474261.

It is an arithmetic number, because the mean of its divisors is an integer number (294525).

Almost surely, 2^20392320 is an apocalyptic number.

20392320 is a gapful number since it is divisible by the number (20) 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 20392320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37699200).

20392320 is an abundant number, since it is smaller than the sum of its proper divisors (55006080).

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

20392320 is a wasteful number, since it uses less digits than its factorization.

20392320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20392320 is about 4515.7856459314. The cubic root of 20392320 is about 273.2051484345.

The spelling of 20392320 in words is "twenty million, three hundred ninety-two thousand, three hundred twenty".