20296780 has 72 divisors (see below), whose sum is σ = 50274000. Its totient is φ = 6862464.

The previous prime is 20296777. The next prime is 20296789. The reversal of 20296780 is 8769202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20296789) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136146 + ... + 136294.

It is an arithmetic number, because the mean of its divisors is an integer number (698250).

Almost surely, 2^20296780 is an apocalyptic number.

20296780 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 20296780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25137000).

20296780 is an abundant number, since it is smaller than the sum of its proper divisors (29977220).

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

20296780 is a wasteful number, since it uses less digits than its factorization.

20296780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20296780 is about 4505.1947793630. The cubic root of 20296780 is about 272.7778161543. Note that the first 3 decimals are identical.

The spelling of 20296780 in words is "twenty million, two hundred ninety-six thousand, seven hundred eighty".