20497461261 has 16 divisors (see below), whose sum is σ = 28552296960. Its totient is φ = 13063131200.

The previous prime is 20497461209. The next prime is 20497461301. The reversal of 20497461261 is 16216479402.

It is not a de Polignac number, because 20497461261 - 2¹⁸ = 20497199117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497461161) 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, 1157565 + ... + 1175138.

It is an arithmetic number, because the mean of its divisors is an integer number (1784518560).

Almost surely, 2^20497461261 is an apocalyptic number.

It is an amenable number.

20497461261 is a deficient number, since it is larger than the sum of its proper divisors (8054835699).

20497461261 is a wasteful number, since it uses less digits than its factorization.

20497461261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332836.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 20497461261 in words is "twenty billion, four hundred ninety-seven million, four hundred sixty-one thousand, two hundred sixty-one".