20835172137 has 32 divisors (see below), whose sum is σ = 32698874880. Its totient is φ = 11678146560.

The previous prime is 20835172129. The next prime is 20835172187. The reversal of 20835172137 is 73127153802.

It is not a de Polignac number, because 20835172137 - 2³ = 20835172129 is a prime.

It is a super-2 number, since 2×20835172137² (a number of 21 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 20835172095 and 20835172104.

It is not an unprimeable number, because it can be changed into a prime (20835172187) 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, 486312 + ... + 527417.

It is an arithmetic number, because the mean of its divisors is an integer number (1021839840).

Almost surely, 2^20835172137 is an apocalyptic number.

It is an amenable number.

20835172137 is a deficient number, since it is larger than the sum of its proper divisors (11863702743).

20835172137 is a wasteful number, since it uses less digits than its factorization.

20835172137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013793.

The product of its (nonzero) digits is 70560, while the sum is 39.

The spelling of 20835172137 in words is "twenty billion, eight hundred thirty-five million, one hundred seventy-two thousand, one hundred thirty-seven".