20277540 has 60 divisors (see below), whose sum is σ = 63616476. Its totient is φ = 5406912.

The previous prime is 20277527. The next prime is 20277577. The reversal of 20277540 is 4577202.

It can be written as a sum of positive squares in 2 ways, for example, as 14017536 + 6260004 = 3744^2 + 2502^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×20277540² = 822357256903200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 4639 + ... + 7878.

Almost surely, 2^20277540 is an apocalyptic number.

20277540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20277540 is an abundant number, since it is smaller than the sum of its proper divisors (43338936).

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

20277540 is a wasteful number, since it uses less digits than its factorization.

20277540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12538 (or 12527 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 20277540 is about 4503.0589603069. The cubic root of 20277540 is about 272.6915971516.

The spelling of 20277540 in words is "twenty million, two hundred seventy-seven thousand, five hundred forty".