20514551655 has 64 divisors (see below), whose sum is σ = 37372608000. Its totient is φ = 9525745152.

The previous prime is 20514551647. The next prime is 20514551663. The reversal of 20514551655 is 55615541502.

It is an interprime number because it is at equal distance from previous prime (20514551647) and next prime (20514551663).

It is not a de Polignac number, because 20514551655 - 2³ = 20514551647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 836356 + ... + 860534.

It is an arithmetic number, because the mean of its divisors is an integer number (583947000).

Almost surely, 2^20514551655 is an apocalyptic number.

20514551655 is a deficient number, since it is larger than the sum of its proper divisors (16858056345).

20514551655 is a wasteful number, since it uses less digits than its factorization.

20514551655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24448.

The product of its (nonzero) digits is 150000, while the sum is 39.

The spelling of 20514551655 in words is "twenty billion, five hundred fourteen million, five hundred fifty-one thousand, six hundred fifty-five".