20780258 has 4 divisors (see below), whose sum is σ = 31170390. Its totient is φ = 10390128.

The previous prime is 20780257. The next prime is 20780303. The reversal of 20780258 is 85208702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13741849 + 7038409 = 3707^2 + 2653^2 .

It is not an unprimeable number, because it can be changed into a prime (20780257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5195063 + ... + 5195066.

Almost surely, 2^20780258 is an apocalyptic number.

20780258 is a deficient number, since it is larger than the sum of its proper divisors (10390132).

20780258 is a wasteful number, since it uses less digits than its factorization.

20780258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10390131.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 20780258 is about 4558.5368266583. The cubic root of 20780258 is about 274.9267375087.

The spelling of 20780258 in words is "twenty million, seven hundred eighty thousand, two hundred fifty-eight".