20780752 has 10 divisors (see below), whose sum is σ = 40262738. Its totient is φ = 10390368.

The previous prime is 20780743. The next prime is 20780759. The reversal of 20780752 is 25708702.

It can be written as a sum of positive squares in only one way, i.e., 16353936 + 4426816 = 4044^2 + 2104^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20780759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649383 + ... + 649414.

Almost surely, 2^20780752 is an apocalyptic number.

It is an amenable number.

20780752 is a deficient number, since it is larger than the sum of its proper divisors (19481986).

20780752 is a wasteful number, since it uses less digits than its factorization.

20780752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298805 (or 1298799 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 20780752 is about 4558.5910103891. The cubic root of 20780752 is about 274.9289160626.

The spelling of 20780752 in words is "twenty million, seven hundred eighty thousand, seven hundred fifty-two".