20392780 has 12 divisors (see below), whose sum is σ = 42824880. Its totient is φ = 8157104.

The previous prime is 20392763. The next prime is 20392781. The reversal of 20392780 is 8729302.

It is a super-2 number, since 2×20392780² = 831730952256800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20392781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509800 + ... + 509839.

It is an arithmetic number, because the mean of its divisors is an integer number (3568740).

Almost surely, 2^20392780 is an apocalyptic number.

20392780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20392780 is an abundant number, since it is smaller than the sum of its proper divisors (22432100).

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

20392780 is a wasteful number, since it uses less digits than its factorization.

20392780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019648 (or 1019646 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20392780 is about 4515.8365780883. The cubic root of 20392780 is about 273.2072026952.

The spelling of 20392780 in words is "twenty million, three hundred ninety-two thousand, seven hundred eighty".