20280750 has 64 divisors (see below), whose sum is σ = 57867264. Its totient is φ = 4634400.

The previous prime is 20280749. The next prime is 20280751. The reversal of 20280750 is 5708202.

It is an interprime number because it is at equal distance from previous prime (20280749) and next prime (20280751).

It is a super-2 number, since 2×20280750² = 822617641125000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20280750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3319 + ... + 7181.

It is an arithmetic number, because the mean of its divisors is an integer number (904176).

Almost surely, 2^20280750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20280750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28933632).

20280750 is an abundant number, since it is smaller than the sum of its proper divisors (37586514).

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

20280750 is a wasteful number, since it uses less digits than its factorization.

20280750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890 (or 3880 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 20280750 is about 4503.4153705826. The cubic root of 20280750 is about 272.7059857123.

Adding to 20280750 its reverse (5708202), we get a palindrome (25988952).

It can be divided in two parts, 20280 and 750, that multiplied together give a square (15210000 = 3900²).

The spelling of 20280750 in words is "twenty million, two hundred eighty thousand, seven hundred fifty".