20764736 has 14 divisors (see below), whose sum is σ = 41205150. Its totient is φ = 10382336.

The previous prime is 20764717. The next prime is 20764753. The reversal of 20764736 is 63746702.

It can be written as a sum of positive squares in only one way, i.e., 13366336 + 7398400 = 3656^2 + 2720^2 .

It is a super-2 number, since 2×20764736² = 862348522299392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20764696 and 20764705.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162161 + ... + 162288.

It is an arithmetic number, because the mean of its divisors is an integer number (2943225).

Almost surely, 2^20764736 is an apocalyptic number.

It is an amenable number.

20764736 is a deficient number, since it is larger than the sum of its proper divisors (20440414).

20764736 is an equidigital number, since it uses as much as digits as its factorization.

20764736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324461 (or 324451 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 20764736 is about 4556.8339886373. The cubic root of 20764736 is about 274.8582674607.

The spelling of 20764736 in words is "twenty million, seven hundred sixty-four thousand, seven hundred thirty-six".