20780072 has 16 divisors (see below), whose sum is σ = 41013600. Its totient is φ = 9843120.

The previous prime is 20780059. The next prime is 20780093. The reversal of 20780072 is 27008702.

It is a super-2 number, since 2×20780072² = 863622784650368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68204 + ... + 68507.

It is an arithmetic number, because the mean of its divisors is an integer number (2563350).

Almost surely, 2^20780072 is an apocalyptic number.

It is an amenable number.

20780072 is a deficient number, since it is larger than the sum of its proper divisors (20233528).

20780072 is a wasteful number, since it uses less digits than its factorization.

20780072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136736 (or 136732 counting only the distinct ones).

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

The square root of 20780072 is about 4558.5164253296. The cubic root of 20780072 is about 274.9259172346.

Adding to 20780072 its reverse (27008702), we get a palindrome (47788774).

The spelling of 20780072 in words is "twenty million, seven hundred eighty thousand, seventy-two".