20711021506 has 32 divisors (see below), whose sum is σ = 37353601152. Its totient is φ = 8425607040.

The previous prime is 20711021503. The next prime is 20711021521. The reversal of 20711021506 is 60512011702.

It is not an unprimeable number, because it can be changed into a prime (20711021503) 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, 466356 + ... + 508831.

It is an arithmetic number, because the mean of its divisors is an integer number (1167300036).

Almost surely, 2^20711021506 is an apocalyptic number.

20711021506 is a deficient number, since it is larger than the sum of its proper divisors (16642579646).

20711021506 is a wasteful number, since it uses less digits than its factorization.

20711021506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975274.

The product of its (nonzero) digits is 840, while the sum is 25.

The spelling of 20711021506 in words is "twenty billion, seven hundred eleven million, twenty-one thousand, five hundred six".