20747990490 has 16 divisors (see below), whose sum is σ = 49795177248. Its totient is φ = 5532797456.

The previous prime is 20747990479. The next prime is 20747990491. The reversal of 20747990490 is 9409974702.

It is not an unprimeable number, because it can be changed into a prime (20747990491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345799812 + ... + 345799871.

It is an arithmetic number, because the mean of its divisors is an integer number (3112198578).

Almost surely, 2^20747990490 is an apocalyptic number.

20747990490 is an abundant number, since it is smaller than the sum of its proper divisors (29047186758).

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

20747990490 is a wasteful number, since it uses less digits than its factorization.

20747990490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691599693.

The product of its (nonzero) digits is 1143072, while the sum is 51.

The spelling of 20747990490 in words is "twenty billion, seven hundred forty-seven million, nine hundred ninety thousand, four hundred ninety".