20277440 has 28 divisors (see below), whose sum is σ = 48286416. Its totient is φ = 8110848.

The previous prime is 20277419. The next prime is 20277449. The reversal of 20277440 is 4477202.

It is a super-2 number, since 2×20277440² = 822349145907200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20277449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31364 + ... + 32003.

Almost surely, 2^20277440 is an apocalyptic number.

20277440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20277440 is an abundant number, since it is smaller than the sum of its proper divisors (28008976).

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

20277440 is an equidigital number, since it uses as much as digits as its factorization.

20277440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63384 (or 63374 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 20277440 is about 4503.0478567299. The cubic root of 20277440 is about 272.6911488855.

The spelling of 20277440 in words is "twenty million, two hundred seventy-seven thousand, four hundred forty".