20015211320 has 128 divisors (see below), whose sum is σ = 50017443840. Its totient is φ = 7161868800.

The previous prime is 20015211301. The next prime is 20015211347. The reversal of 20015211320 is 2311251002.

It is a happy number.

It is a super-2 number, since 2×20015211320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2513345 + ... + 2521295.

It is an arithmetic number, because the mean of its divisors is an integer number (390761280).

Almost surely, 2^20015211320 is an apocalyptic number.

20015211320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20015211320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25008721920).

20015211320 is an abundant number, since it is smaller than the sum of its proper divisors (30002232520).

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

20015211320 is a wasteful number, since it uses less digits than its factorization.

20015211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8125 (or 8121 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20015211320 its reverse (2311251002), we get a palindrome (22326462322).

The spelling of 20015211320 in words is "twenty billion, fifteen million, two hundred eleven thousand, three hundred twenty".