20780270 has 32 divisors (see below), whose sum is σ = 44610048. Its totient is φ = 6814368.

The previous prime is 20780257. The next prime is 20780303. The reversal of 20780270 is 7208702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4844 + ... + 8063.

It is an arithmetic number, because the mean of its divisors is an integer number (1394064).

Almost surely, 2^20780270 is an apocalyptic number.

20780270 is an abundant number, since it is smaller than the sum of its proper divisors (23829778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20780270 is a wasteful number, since it uses less digits than its factorization.

20780270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12944.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 20780270 is about 4558.5381428699. The cubic root of 20780270 is about 274.9267904295.

Adding to 20780270 its reverse (7208702), we get a palindrome (27988972).

The spelling of 20780270 in words is "twenty million, seven hundred eighty thousand, two hundred seventy".