20138351 has 2 divisors, whose sum is σ = 20138352. Its totient is φ = 20138350.

The previous prime is 20138329. The next prime is 20138389. The reversal of 20138351 is 15383102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20138351 - 2¹⁴ = 20121967 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 (20138311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10069175 + 10069176.

It is an arithmetic number, because the mean of its divisors is an integer number (10069176).

Almost surely, 2^20138351 is an apocalyptic number.

20138351 is a deficient number, since it is larger than the sum of its proper divisors (1).

20138351 is an equidigital number, since it uses as much as digits as its factorization.

20138351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20138351 is about 4487.5774088031. The cubic root of 20138351 is about 272.0662279260.

The spelling of 20138351 in words is "twenty million, one hundred thirty-eight thousand, three hundred fifty-one".