20438567 has 2 divisors, whose sum is σ = 20438568. Its totient is φ = 20438566.

The previous prime is 20438521. The next prime is 20438581. The reversal of 20438567 is 76583402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20438567 - 2⁸ = 20438311 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20438767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219283 + 10219284.

It is an arithmetic number, because the mean of its divisors is an integer number (10219284).

Almost surely, 2^20438567 is an apocalyptic number.

20438567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20438567 is an equidigital number, since it uses as much as digits as its factorization.

20438567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20438567 is about 4520.9033389357. The cubic root of 20438567 is about 273.4115231725.

The spelling of 20438567 in words is "twenty million, four hundred thirty-eight thousand, five hundred sixty-seven".