20751331 has 2 divisors, whose sum is σ = 20751332. Its totient is φ = 20751330.

The previous prime is 20751257. The next prime is 20751337. The reversal of 20751331 is 13315702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20751331 - 2¹¹ = 20749283 is a prime.

It is a super-2 number, since 2×20751331² = 861235476543122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20751337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10375665 + 10375666.

It is an arithmetic number, because the mean of its divisors is an integer number (10375666).

Almost surely, 2^20751331 is an apocalyptic number.

20751331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20751331 is an equidigital number, since it uses as much as digits as its factorization.

20751331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20751331 is about 4555.3628834595. The cubic root of 20751331 is about 274.7991083778.

The spelling of 20751331 in words is "twenty million, seven hundred fifty-one thousand, three hundred thirty-one".