20749682 has 6 divisors (see below), whose sum is σ = 31134189. Its totient is φ = 10371620.

The previous prime is 20749681. The next prime is 20749697. The reversal of 20749682 is 28694702.

It can be written as a sum of positive squares in 2 ways, for example, as 19088161 + 1661521 = 4369^2 + 1289^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3221.

It is a super-2 number, since 2×20749682² = 861098606202248, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20749681) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4832 + ... + 8052.

Almost surely, 2^20749682 is an apocalyptic number.

20749682 is a deficient number, since it is larger than the sum of its proper divisors (10384507).

20749682 is an frugal number, since it uses more digits than its factorization.

20749682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444 (or 3223 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20749682 is about 4555.1818844037. The cubic root of 20749682 is about 274.7918292346.

The spelling of 20749682 in words is "twenty million, seven hundred forty-nine thousand, six hundred eighty-two".