20780025 has 24 divisors (see below), whose sum is σ = 39265344. Its totient is φ = 9499200.

The previous prime is 20780003. The next prime is 20780033. The reversal of 20780025 is 52008702.

It is not a de Polignac number, because 20780025 - 2⁷ = 20779897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20779977 and 20780004.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19266 + ... + 20315.

It is an arithmetic number, because the mean of its divisors is an integer number (1636056).

Almost surely, 2^20780025 is an apocalyptic number.

20780025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20780025 is a deficient number, since it is larger than the sum of its proper divisors (18485319).

20780025 is a wasteful number, since it uses less digits than its factorization.

20780025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39601 (or 39596 counting only the distinct ones).

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

The square root of 20780025 is about 4558.5112701407. The cubic root of 20780025 is about 274.9257099602.

Adding to 20780025 its reverse (52008702), we get a palindrome (72788727).

The spelling of 20780025 in words is "twenty million, seven hundred eighty thousand, twenty-five".