20667220072 has 8 divisors (see below), whose sum is σ = 38751037650. Its totient is φ = 10333610032.

The previous prime is 20667220039. The next prime is 20667220117. The reversal of 20667220072 is 27002276602.

It can be written as a sum of positive squares in only one way, i.e., 13603489956 + 7063730116 = 116634^2 + 84046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1291701247 + ... + 1291701262.

Almost surely, 2^20667220072 is an apocalyptic number.

It is an amenable number.

20667220072 is a deficient number, since it is larger than the sum of its proper divisors (18083817578).

20667220072 is a wasteful number, since it uses less digits than its factorization.

20667220072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583402515 (or 2583402511 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

Adding to 20667220072 its reverse (27002276602), we get a palindrome (47669496674).

The spelling of 20667220072 in words is "twenty billion, six hundred sixty-seven million, two hundred twenty thousand, seventy-two".