20011523407 has 2 divisors, whose sum is σ = 20011523408. Its totient is φ = 20011523406.

The previous prime is 20011523393. The next prime is 20011523461. The reversal of 20011523407 is 70432511002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011523407 is a prime.

It is a super-2 number, since 2×20011523407² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011523107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005761703 + 10005761704.

It is an arithmetic number, because the mean of its divisors is an integer number (10005761704).

Almost surely, 2^20011523407 is an apocalyptic number.

20011523407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011523407 is an equidigital number, since it uses as much as digits as its factorization.

20011523407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The spelling of 20011523407 in words is "twenty billion, eleven million, five hundred twenty-three thousand, four hundred seven".