20440377 has 16 divisors (see below), whose sum is σ = 31260160. Its totient is φ = 13186800.

The previous prime is 20440369. The next prime is 20440379. The reversal of 20440377 is 77304402.

It is not a de Polignac number, because 20440377 - 2³ = 20440369 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20440377.

It is not an unprimeable number, because it can be changed into a prime (20440379) 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, 11374 + ... + 13047.

It is an arithmetic number, because the mean of its divisors is an integer number (1953760).

Almost surely, 2^20440377 is an apocalyptic number.

20440377 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20440377 is a deficient number, since it is larger than the sum of its proper divisors (10819783).

20440377 is a wasteful number, since it uses less digits than its factorization.

20440377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24461 (or 24455 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 20440377 is about 4521.1035157360. The cubic root of 20440377 is about 273.4195938663.

Adding to 20440377 its reverse (77304402), we get a palindrome (97744779).

It can be divided in two parts, 204403 and 77, that added together give a triangular number (204480 = T₆₃₉).

The spelling of 20440377 in words is "twenty million, four hundred forty thousand, three hundred seventy-seven".