20356435739 has 2 divisors, whose sum is σ = 20356435740. Its totient is φ = 20356435738.

The previous prime is 20356435703. The next prime is 20356435747. The reversal of 20356435739 is 93753465302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20356435739 - 2¹² = 20356431643 is a prime.

It is a super-2 number, since 2×20356435739² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20356435693 and 20356435702.

It is not a weakly prime, because it can be changed into another prime (20356435439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178217869 + 10178217870.

It is an arithmetic number, because the mean of its divisors is an integer number (10178217870).

Almost surely, 2^20356435739 is an apocalyptic number.

20356435739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356435739 is an equidigital number, since it uses as much as digits as its factorization.

20356435739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 47.

The spelling of 20356435739 in words is "twenty billion, three hundred fifty-six million, four hundred thirty-five thousand, seven hundred thirty-nine".