20545388517801 has 32 divisors (see below), whose sum is σ = 34893539112960. Its totient is φ = 10468061726976.

The previous prime is 20545388517799. The next prime is 20545388517803. The reversal of 20545388517801 is 10871588354502.

It is an interprime number because it is at equal distance from previous prime (20545388517799) and next prime (20545388517803).

It is not a de Polignac number, because 20545388517801 - 2¹ = 20545388517799 is a prime.

It is a super-2 number, since 2×20545388517801² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (20545388517803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1514469741 + ... + 1514483306.

It is an arithmetic number, because the mean of its divisors is an integer number (1090423097280).

Almost surely, 2^{20545388517801} is an apocalyptic number.

20545388517801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20545388517801 is a deficient number, since it is larger than the sum of its proper divisors (14348150595159).

20545388517801 is a wasteful number, since it uses less digits than its factorization.

20545388517801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028953093.

The product of its (nonzero) digits is 10752000, while the sum is 57.

The spelling of 20545388517801 in words is "twenty trillion, five hundred forty-five billion, three hundred eighty-eight million, five hundred seventeen thousand, eight hundred one".