20213546820 has 48 divisors (see below), whose sum is σ = 57525776448. Its totient is φ = 5301912960.

The previous prime is 20213546819. The next prime is 20213546831. The reversal of 20213546820 is 2864531202.

It is a super-2 number, since 2×20213546820² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2757754 + ... + 2765073.

It is an arithmetic number, because the mean of its divisors is an integer number (1198453676).

Almost surely, 2^20213546820 is an apocalyptic number.

20213546820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20213546820 is an abundant number, since it is smaller than the sum of its proper divisors (37312229628).

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

20213546820 is a wasteful number, since it uses less digits than its factorization.

20213546820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5522900 (or 5522898 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 20213546820 in words is "twenty billion, two hundred thirteen million, five hundred forty-six thousand, eight hundred twenty".