20401323320 has 64 divisors (see below), whose sum is σ = 52498437120. Its totient is φ = 6989687424.

The previous prime is 20401323281. The next prime is 20401323343. The reversal of 20401323320 is 2332310402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20401323292 and 20401323301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372839 + ... + 424041.

It is an arithmetic number, because the mean of its divisors is an integer number (820288080).

Almost surely, 2^20401323320 is an apocalyptic number.

20401323320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401323320 is an abundant number, since it is smaller than the sum of its proper divisors (32097113800).

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

20401323320 is a wasteful number, since it uses less digits than its factorization.

20401323320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52644 (or 52640 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20401323320 its reverse (2332310402), we get a palindrome (22733633722).

The spelling of 20401323320 in words is "twenty billion, four hundred one million, three hundred twenty-three thousand, three hundred twenty".