20011523408 has 20 divisors (see below), whose sum is σ = 39820228500. Its totient is φ = 9735335424.

The previous prime is 20011523407. The next prime is 20011523461. The reversal of 20011523408 is 80432511002.

It can be written as a sum of positive squares in 2 ways, for example, as 17122245904 + 2889277504 = 130852^2 + 53752^2 .

It is a super-2 number, since 2×20011523408² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011523407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16901033 + ... + 16902216.

It is an arithmetic number, because the mean of its divisors is an integer number (1991011425).

Almost surely, 2^20011523408 is an apocalyptic number.

It is an amenable number.

20011523408 is a deficient number, since it is larger than the sum of its proper divisors (19808705092).

20011523408 is a wasteful number, since it uses less digits than its factorization.

20011523408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33803294 (or 33803288 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 20011523408 in words is "twenty billion, eleven million, five hundred twenty-three thousand, four hundred eight".