20672769 has 16 divisors (see below), whose sum is σ = 29829632. Its totient is φ = 12659328.

The previous prime is 20672767. The next prime is 20672803. The reversal of 20672769 is 96727602.

It is not a de Polignac number, because 20672769 - 2¹ = 20672767 is a prime.

It is a super-2 number, since 2×20672769² = 854726756254722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20672767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7509 + ... + 9885.

It is an arithmetic number, because the mean of its divisors is an integer number (1864352).

Almost surely, 2^20672769 is an apocalyptic number.

It is an amenable number.

20672769 is a deficient number, since it is larger than the sum of its proper divisors (9156863).

20672769 is a wasteful number, since it uses less digits than its factorization.

20672769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 20672769 is about 4546.7316833084. The cubic root of 20672769 is about 274.4518845597.

The spelling of 20672769 in words is "twenty million, six hundred seventy-two thousand, seven hundred sixty-nine".