20377639 has 8 divisors (see below), whose sum is σ = 21225888. Its totient is φ = 19545120.

The previous prime is 20377627. The next prime is 20377661. The reversal of 20377639 is 93677302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20377639 - 2⁹ = 20377127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20377598 and 20377607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20377619) by changing a digit.

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, 1252 + ... + 6505.

It is an arithmetic number, because the mean of its divisors is an integer number (2653236).

Almost surely, 2^20377639 is an apocalyptic number.

20377639 is a deficient number, since it is larger than the sum of its proper divisors (848249).

20377639 is an equidigital number, since it uses as much as digits as its factorization.

20377639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7865.

The product of its (nonzero) digits is 47628, while the sum is 37.

The square root of 20377639 is about 4514.1598332359. The cubic root of 20377639 is about 273.1395700257.

The spelling of 20377639 in words is "twenty million, three hundred seventy-seven thousand, six hundred thirty-nine".