20842749506 has 16 divisors (see below), whose sum is σ = 31334869440. Its totient is φ = 10397811600.

The previous prime is 20842749497. The next prime is 20842749509. The reversal of 20842749506 is 60594724802.

It is not an unprimeable number, because it can be changed into a prime (20842749509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4207331 + ... + 4212281.

It is an arithmetic number, because the mean of its divisors is an integer number (1958429340).

Almost surely, 2^20842749506 is an apocalyptic number.

20842749506 is a deficient number, since it is larger than the sum of its proper divisors (10492119934).

20842749506 is a wasteful number, since it uses less digits than its factorization.

20842749506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9289.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 20842749506 in words is "twenty billion, eight hundred forty-two million, seven hundred forty-nine thousand, five hundred six".