20977393 has 2 divisors, whose sum is σ = 20977394. Its totient is φ = 20977392.

The previous prime is 20977381. The next prime is 20977441. The reversal of 20977393 is 39377902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18766224 + 2211169 = 4332^2 + 1487^2 .

It is a cyclic number.

It is not a de Polignac number, because 20977393 - 2²¹ = 18880241 is a prime.

It is not a weakly prime, because it can be changed into another prime (20977193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488696 + 10488697.

It is an arithmetic number, because the mean of its divisors is an integer number (10488697).

Almost surely, 2^20977393 is an apocalyptic number.

It is an amenable number.

20977393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20977393 is an equidigital number, since it uses as much as digits as its factorization.

20977393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 40.

The square root of 20977393 is about 4580.1084048306. The cubic root of 20977393 is about 275.7933805055.

The spelling of 20977393 in words is "twenty million, nine hundred seventy-seven thousand, three hundred ninety-three".