20702771953 has 2 divisors, whose sum is σ = 20702771954. Its totient is φ = 20702771952.

The previous prime is 20702771933. The next prime is 20702771977. The reversal of 20702771953 is 35917720702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11331176704 + 9371595249 = 106448^2 + 96807^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20702771953 is a prime.

It is not a weakly prime, because it can be changed into another prime (20702771933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10351385976 + 10351385977.

It is an arithmetic number, because the mean of its divisors is an integer number (10351385977).

Almost surely, 2^20702771953 is an apocalyptic number.

It is an amenable number.

20702771953 is a deficient number, since it is larger than the sum of its proper divisors (1).

20702771953 is an equidigital number, since it uses as much as digits as its factorization.

20702771953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 43.

The spelling of 20702771953 in words is "twenty billion, seven hundred two million, seven hundred seventy-one thousand, nine hundred fifty-three".