20777469 has 16 divisors (see below), whose sum is σ = 29452800. Its totient is φ = 12991536.

The previous prime is 20777443. The next prime is 20777483. The reversal of 20777469 is 96477702.

It is not a de Polignac number, because 20777469 - 2⁹ = 20776957 is a prime.

It is a super-2 number, since 2×20777469² = 863406436091922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20777469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20777429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4102 + ... + 7640.

It is an arithmetic number, because the mean of its divisors is an integer number (1840800).

Almost surely, 2^20777469 is an apocalyptic number.

It is an amenable number.

20777469 is a deficient number, since it is larger than the sum of its proper divisors (8675331).

20777469 is a wasteful number, since it uses less digits than its factorization.

20777469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3664.

The product of its (nonzero) digits is 148176, while the sum is 42.

The square root of 20777469 is about 4558.2309068322. The cubic root of 20777469 is about 274.9144372929.

The spelling of 20777469 in words is "twenty million, seven hundred seventy-seven thousand, four hundred sixty-nine".