20776440 has 32 divisors (see below), whose sum is σ = 62329680. Its totient is φ = 5540352.

The previous prime is 20776433. The next prime is 20776451. The reversal of 20776440 is 4467702.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20776398 and 20776407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86449 + ... + 86688.

Almost surely, 2^20776440 is an apocalyptic number.

20776440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20776440 is an abundant number, since it is smaller than the sum of its proper divisors (41553240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20776440 is a wasteful number, since it uses less digits than its factorization.

20776440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173151 (or 173147 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 20776440 is about 4558.1180326973. The cubic root of 20776440 is about 274.9098988571.

The spelling of 20776440 in words is "twenty million, seven hundred seventy-six thousand, four hundred forty".