20780925 has 24 divisors (see below), whose sum is σ = 37482720. Its totient is φ = 10075200.

The previous prime is 20780887. The next prime is 20780941. The reversal of 20780925 is 52908702.

It is not a de Polignac number, because 20780925 - 2⁷ = 20780797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

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, 11770 + ... + 13419.

It is an arithmetic number, because the mean of its divisors is an integer number (1561780).

Almost surely, 2^20780925 is an apocalyptic number.

20780925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20780925 is a deficient number, since it is larger than the sum of its proper divisors (16701795).

20780925 is a wasteful number, since it uses less digits than its factorization.

20780925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25213 (or 25208 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 20780925 is about 4558.6099855109. The cubic root of 20780925 is about 274.9296789892.

The spelling of 20780925 in words is "twenty million, seven hundred eighty thousand, nine hundred twenty-five".