20750380 has 48 divisors (see below), whose sum is σ = 50319360. Its totient is φ = 7040448.

The previous prime is 20750371. The next prime is 20750407. The reversal of 20750380 is 8305702.

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, 13701 + ... + 15139.

It is an arithmetic number, because the mean of its divisors is an integer number (1048320).

Almost surely, 2^20750380 is an apocalyptic number.

20750380 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 20750380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25159680).

20750380 is an abundant number, since it is smaller than the sum of its proper divisors (29568980).

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

20750380 is a wasteful number, since it uses less digits than its factorization.

20750380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558 (or 1556 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20750380 is about 4555.2584998000. The cubic root of 20750380 is about 274.7949104472.

The spelling of 20750380 in words is "twenty million, seven hundred fifty thousand, three hundred eighty".