20407273357 has 2 divisors, whose sum is σ = 20407273358. Its totient is φ = 20407273356.

The previous prime is 20407273261. The next prime is 20407273409. The reversal of 20407273357 is 75337270402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16927571236 + 3479702121 = 130106^2 + 58989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20407273357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20407273657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203636678 + 10203636679.

It is an arithmetic number, because the mean of its divisors is an integer number (10203636679).

Almost surely, 2^20407273357 is an apocalyptic number.

It is an amenable number.

20407273357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20407273357 is an equidigital number, since it uses as much as digits as its factorization.

20407273357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 40.

It can be divided in two parts, 20407 and 273357, that added together give a square (293764 = 542²).

The spelling of 20407273357 in words is "twenty billion, four hundred seven million, two hundred seventy-three thousand, three hundred fifty-seven".