20490766635 has 16 divisors (see below), whose sum is σ = 32906211840. Its totient is φ = 10888080480.

The previous prime is 20490766633. The next prime is 20490766643. The reversal of 20490766635 is 53666709402.

It is not a de Polignac number, because 20490766635 - 2¹ = 20490766633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20490766633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2516325 + ... + 2524454.

It is an arithmetic number, because the mean of its divisors is an integer number (2056638240).

Almost surely, 2^20490766635 is an apocalyptic number.

20490766635 is a deficient number, since it is larger than the sum of its proper divisors (12415445205).

20490766635 is a wasteful number, since it uses less digits than its factorization.

20490766635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041058.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 20490766635 in words is "twenty billion, four hundred ninety million, seven hundred sixty-six thousand, six hundred thirty-five".