20011523107 has 2 divisors, whose sum is σ = 20011523108. Its totient is φ = 20011523106.

The previous prime is 20011523099. The next prime is 20011523113. The reversal of 20011523107 is 70132511002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011523107 - 2³ = 20011523099 is a prime.

It is a super-2 number, since 2×20011523107² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20011523407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005761553 + 10005761554.

It is an arithmetic number, because the mean of its divisors is an integer number (10005761554).

Almost surely, 2^20011523107 is an apocalyptic number.

20011523107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011523107 is an equidigital number, since it uses as much as digits as its factorization.

20011523107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The spelling of 20011523107 in words is "twenty billion, eleven million, five hundred twenty-three thousand, one hundred seven".