20438975 has 12 divisors (see below), whose sum is σ = 25935096. Its totient is φ = 15970080.

The previous prime is 20438933. The next prime is 20438989. The reversal of 20438975 is 57983402.

It is not a de Polignac number, because 20438975 - 2¹⁰ = 20437951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8432 + ... + 10581.

It is an arithmetic number, because the mean of its divisors is an integer number (2161258).

Almost surely, 2^20438975 is an apocalyptic number.

20438975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20438975 is a deficient number, since it is larger than the sum of its proper divisors (5496121).

20438975 is a wasteful number, since it uses less digits than its factorization.

20438975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19066 (or 19061 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20438975 is about 4520.9484624357. The cubic root of 20438975 is about 273.4133424644.

The spelling of 20438975 in words is "twenty million, four hundred thirty-eight thousand, nine hundred seventy-five".