20213511450 has 48 divisors (see below), whose sum is σ = 54686740896. Its totient is φ = 4900244800.

The previous prime is 20213511443. The next prime is 20213511457. The reversal of 20213511450 is 5411531202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20213511443) and next prime (20213511457).

It is a super-2 number, since 2×20213511450² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20213511450.

It is not an unprimeable number, because it can be changed into a prime (20213511457) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 6123657 + ... + 6126956.

It is an arithmetic number, because the mean of its divisors is an integer number (1139307102).

Almost surely, 2^20213511450 is an apocalyptic number.

20213511450 is an abundant number, since it is smaller than the sum of its proper divisors (34473229446).

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

20213511450 is a wasteful number, since it uses less digits than its factorization.

20213511450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12250639 (or 12250634 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 20213511450 in words is "twenty billion, two hundred thirteen million, five hundred eleven thousand, four hundred fifty".