20780376 has 64 divisors (see below), whose sum is σ = 55200000. Its totient is φ = 6500736.

The previous prime is 20780369. The next prime is 20780393. The reversal of 20780376 is 67308702.

20780376 = 219² + 220² + ... + 417².

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, 90630 + ... + 90858.

It is an arithmetic number, because the mean of its divisors is an integer number (862500).

Almost surely, 2^20780376 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 20780376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27600000).

20780376 is an abundant number, since it is smaller than the sum of its proper divisors (34419624).

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

20780376 is a wasteful number, since it uses less digits than its factorization.

20780376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 20780376 is about 4558.5497693894. The cubic root of 20780376 is about 274.9272578952.

The spelling of 20780376 in words is "twenty million, seven hundred eighty thousand, three hundred seventy-six".