20356772046 has 32 divisors (see below), whose sum is σ = 45259726848. Its totient is φ = 6061569120.

The previous prime is 20356772041. The next prime is 20356772057. The reversal of 20356772046 is 64027765302.

It is a super-2 number, since 2×20356772046² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20356771989 and 20356772007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356772041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4207006 + ... + 4211841.

It is an arithmetic number, because the mean of its divisors is an integer number (1414366464).

Almost surely, 2^20356772046 is an apocalyptic number.

20356772046 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20356772046 is an abundant number, since it is smaller than the sum of its proper divisors (24902954802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20356772046 is a wasteful number, since it uses less digits than its factorization.

20356772046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8418896.

The product of its (nonzero) digits is 423360, while the sum is 42.

The spelling of 20356772046 in words is "twenty billion, three hundred fifty-six million, seven hundred seventy-two thousand, forty-six".