20954753149 has 16 divisors (see below), whose sum is σ = 23920418304. Its totient is φ = 18182707200.

The previous prime is 20954753143. The next prime is 20954753159. The reversal of 20954753149 is 94135745902.

It is a cyclic number.

It is not a de Polignac number, because 20954753149 - 2¹⁹ = 20954228861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20954753143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396004 + ... + 445789.

It is an arithmetic number, because the mean of its divisors is an integer number (1495026144).

Almost surely, 2^20954753149 is an apocalyptic number.

It is an amenable number.

20954753149 is a deficient number, since it is larger than the sum of its proper divisors (2965665155).

20954753149 is a wasteful number, since it uses less digits than its factorization.

20954753149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841908.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 20954753149 in words is "twenty billion, nine hundred fifty-four million, seven hundred fifty-three thousand, one hundred forty-nine".