20776438 has 16 divisors (see below), whose sum is σ = 31670784. Its totient is φ = 10221120.

The previous prime is 20776433. The next prime is 20776451. The reversal of 20776438 is 83467702.

It is a junction number, because it is equal to n+sod(n) for n = 20776397 and 20776406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20776433) 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, 39618 + ... + 40138.

It is an arithmetic number, because the mean of its divisors is an integer number (1979424).

Almost surely, 2^20776438 is an apocalyptic number.

20776438 is a deficient number, since it is larger than the sum of its proper divisors (10894346).

20776438 is a wasteful number, since it uses less digits than its factorization.

20776438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20776438 is about 4558.1178133085. The cubic root of 20776438 is about 274.9098900359.

It can be divided in two parts, 2077 and 6438, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 20776438 in words is "twenty million, seven hundred seventy-six thousand, four hundred thirty-eight".