20072156506 has 8 divisors (see below), whose sum is σ = 30601812564. Its totient is φ = 9871552320.

The previous prime is 20072156477. The next prime is 20072156527. The reversal of 20072156506 is 60565127002.

It can be written as a sum of positive squares in 2 ways, for example, as 18962667025 + 1109489481 = 137705^2 + 33309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 82262815 + ... + 82263058.

Almost surely, 2^20072156506 is an apocalyptic number.

20072156506 is a deficient number, since it is larger than the sum of its proper divisors (10529656058).

20072156506 is a wasteful number, since it uses less digits than its factorization.

20072156506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164525936.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 20072156506 in words is "twenty billion, seventy-two million, one hundred fifty-six thousand, five hundred six".