20210400340 has 48 divisors (see below), whose sum is σ = 45736942608. Its totient is φ = 7457347584.

The previous prime is 20210400323. The next prime is 20210400341. The reversal of 20210400340 is 4300401202.

It can be written as a sum of positive squares in 8 ways, for example, as 680896836 + 19529503504 = 26094^2 + 139748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210400341) 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, 378754 + ... + 428806.

It is an arithmetic number, because the mean of its divisors is an integer number (952852971).

Almost surely, 2^20210400340 is an apocalyptic number.

20210400340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210400340 is an abundant number, since it is smaller than the sum of its proper divisors (25526542268).

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

20210400340 is a wasteful number, since it uses less digits than its factorization.

20210400340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51628 (or 51626 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20210400340 its reverse (4300401202), we get a palindrome (24510801542).

The spelling of 20210400340 in words is "twenty billion, two hundred ten million, four hundred thousand, three hundred forty".