20438377 has 4 divisors (see below), whose sum is σ = 20936916. Its totient is φ = 19939840.

The previous prime is 20438371. The next prime is 20438387. The reversal of 20438377 is 77383402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4084441 + 16353936 = 2021^2 + 4044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20438377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20438371) 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, 249208 + ... + 249289.

It is an arithmetic number, because the mean of its divisors is an integer number (5234229).

Almost surely, 2^20438377 is an apocalyptic number.

It is an amenable number.

20438377 is a deficient number, since it is larger than the sum of its proper divisors (498539).

20438377 is an equidigital number, since it uses as much as digits as its factorization.

20438377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498538.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 20438377 is about 4520.8823253874. The cubic root of 20438377 is about 273.4106759450.

The spelling of 20438377 in words is "twenty million, four hundred thirty-eight thousand, three hundred seventy-seven".