20011649973 has 16 divisors (see below), whose sum is σ = 30638470656. Its totient is φ = 11381030640.

The previous prime is 20011649963. The next prime is 20011650077. The reversal of 20011649973 is 37994611002.

It is not a de Polignac number, because 20011649973 - 2¹⁸ = 20011387829 is a prime.

It is a super-2 number, since 2×20011649973² (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 (20011649923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2253711 + ... + 2262572.

It is an arithmetic number, because the mean of its divisors is an integer number (1914904416).

Almost surely, 2^20011649973 is an apocalyptic number.

It is an amenable number.

20011649973 is a deficient number, since it is larger than the sum of its proper divisors (10626820683).

20011649973 is a wasteful number, since it uses less digits than its factorization.

20011649973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516504.

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 20011649973 in words is "twenty billion, eleven million, six hundred forty-nine thousand, nine hundred seventy-three".