20988125 has 10 divisors (see below), whose sum is σ = 26227542. Its totient is φ = 16790000.

The previous prime is 20988119. The next prime is 20988131. The reversal of 20988125 is 52188902.

It is an interprime number because it is at equal distance from previous prime (20988119) and next prime (20988131).

It can be written as a sum of positive squares in 5 ways, for example, as 15507844 + 5480281 = 3938^2 + 2341^2 .

It is not a de Polignac number, because 20988125 - 2⁴ = 20988109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16166 + ... + 17415.

Almost surely, 2^20988125 is an apocalyptic number.

20988125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20988125 is a deficient number, since it is larger than the sum of its proper divisors (5239417).

20988125 is an frugal number, since it uses more digits than its factorization.

20988125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33601 (or 33586 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 20988125 is about 4581.2798430133. The cubic root of 20988125 is about 275.8404043017.

The spelling of 20988125 in words is "twenty million, nine hundred eighty-eight thousand, one hundred twenty-five".