20120220309997 has 2 divisors, whose sum is σ = 20120220309998. Its totient is φ = 20120220309996.

The previous prime is 20120220309989. The next prime is 20120220310097. The reversal of 20120220309997 is 79990302202102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16719095032201 + 3401125277796 = 4088899^2 + 1844214^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120220309997 - 2³ = 20120220309989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120220309967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060110154998 + 10060110154999.

It is an arithmetic number, because the mean of its divisors is an integer number (10060110154999).

Almost surely, 2^{20120220309997} is an apocalyptic number.

It is an amenable number.

20120220309997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120220309997 is an equidigital number, since it uses as much as digits as its factorization.

20120220309997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 20120220309997 in words is "twenty trillion, one hundred twenty billion, two hundred twenty million, three hundred nine thousand, nine hundred ninety-seven".