20748025 has 9 divisors (see below), whose sum is σ = 25755823. Its totient is φ = 16580200.

The previous prime is 20748023. The next prime is 20748037. The reversal of 20748025 is 52084702.

The square root of 20748025 is 4555.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7469289 + 13278736 = 2733^2 + 3644^2 .

It is not a de Polignac number, because 20748025 - 2¹ = 20748023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20747984 and 20748002.

It is not an unprimeable number, because it can be changed into a prime (20748023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22320 + ... + 23230.

Almost surely, 2^20748025 is an apocalyptic number.

20748025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20748025 is the 4555-th square number.

20748025 is the 2278-th centered octagonal number.

It is an amenable number.

20748025 is a deficient number, since it is larger than the sum of its proper divisors (5007798).

20748025 is an frugal number, since it uses more digits than its factorization.

20748025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832 (or 916 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The cubic root of 20748025 is about 274.7845143886.

The spelling of 20748025 in words is "twenty million, seven hundred forty-eight thousand, twenty-five".