20966979830 has 16 divisors (see below), whose sum is σ = 37775175984. Its totient is φ = 8379100320.

The previous prime is 20966979809. The next prime is 20966979851. The reversal of 20966979830 is 3897966902.

It is an interprime number because it is at equal distance from previous prime (20966979809) and next prime (20966979851).

It is a super-2 number, since 2×20966979830² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20966979830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 949997 + ... + 971816.

It is an arithmetic number, because the mean of its divisors is an integer number (2360948499).

Almost surely, 2^20966979830 is an apocalyptic number.

20966979830 is a deficient number, since it is larger than the sum of its proper divisors (16808196154).

20966979830 is a wasteful number, since it uses less digits than its factorization.

20966979830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922911.

The product of its (nonzero) digits is 8817984, while the sum is 59.

The spelling of 20966979830 in words is "twenty billion, nine hundred sixty-six million, nine hundred seventy-nine thousand, eight hundred thirty".