20751390690 has 16 divisors (see below), whose sum is σ = 49803337728. Its totient is φ = 5533704176.

The previous prime is 20751390661. The next prime is 20751390743. The reversal of 20751390690 is 9609315702.

It is a super-2 number, since 2×20751390690² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 7 ways as a sum of consecutive naturals, for example, 345856482 + ... + 345856541.

It is an arithmetic number, because the mean of its divisors is an integer number (3112708608).

Almost surely, 2^20751390690 is an apocalyptic number.

20751390690 is an abundant number, since it is smaller than the sum of its proper divisors (29051947038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20751390690 is a wasteful number, since it uses less digits than its factorization.

20751390690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691713033.

The product of its (nonzero) digits is 102060, while the sum is 42.

The spelling of 20751390690 in words is "twenty billion, seven hundred fifty-one million, three hundred ninety thousand, six hundred ninety".