20780036 has 24 divisors (see below), whose sum is σ = 37255680. Its totient is φ = 10138400.

The previous prime is 20780033. The next prime is 20780047. The reversal of 20780036 is 63008702.

It is a super-2 number, since 2×20780036² = 863619792322592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20779987 and 20780014.

It is not an unprimeable number, because it can be changed into a prime (20780033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44846 + ... + 45306.

It is an arithmetic number, because the mean of its divisors is an integer number (1552320).

Almost surely, 2^20780036 is an apocalyptic number.

It is an amenable number.

20780036 is a deficient number, since it is larger than the sum of its proper divisors (16475644).

20780036 is a wasteful number, since it uses less digits than its factorization.

20780036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20780036 is about 4558.5124766748. The cubic root of 20780036 is about 274.9257584713.

Adding to 20780036 its reverse (63008702), we get a palindrome (83788738).

The spelling of 20780036 in words is "twenty million, seven hundred eighty thousand, thirty-six".