20280341640 has 64 divisors (see below), whose sum is σ = 65521108800. Its totient is φ = 4992083712.

The previous prime is 20280341611. The next prime is 20280341647. The reversal of 20280341640 is 4614308202.

It is a super-2 number, since 2×20280341640² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20280341598 and 20280341607.

It is not an unprimeable number, because it can be changed into a prime (20280341647) 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, 6498550 + ... + 6501669.

It is an arithmetic number, because the mean of its divisors is an integer number (1023767325).

Almost surely, 2^20280341640 is an apocalyptic number.

20280341640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20280341640 is an abundant number, since it is smaller than the sum of its proper divisors (45240767160).

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

20280341640 is a wasteful number, since it uses less digits than its factorization.

20280341640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13000246 (or 13000242 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 20280341640 its reverse (4614308202), we get a palindrome (24894649842).

The spelling of 20280341640 in words is "twenty billion, two hundred eighty million, three hundred forty-one thousand, six hundred forty".