20762381 has 2 divisors, whose sum is σ = 20762382. Its totient is φ = 20762380.

The previous prime is 20762377. The next prime is 20762407. The reversal of 20762381 is 18326702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11792356 + 8970025 = 3434^2 + 2995^2 .

It is a cyclic number.

It is not a de Polignac number, because 20762381 - 2² = 20762377 is a prime.

It is a super-2 number, since 2×20762381² = 862152929578322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20762311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10381190 + 10381191.

It is an arithmetic number, because the mean of its divisors is an integer number (10381191).

Almost surely, 2^20762381 is an apocalyptic number.

It is an amenable number.

20762381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20762381 is an equidigital number, since it uses as much as digits as its factorization.

20762381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20762381 is about 4556.5755782166. The cubic root of 20762381 is about 274.8478761946.

The spelling of 20762381 in words is "twenty million, seven hundred sixty-two thousand, three hundred eighty-one".