20280513708 has 144 divisors (see below), whose sum is σ = 63210172480. Its totient is φ = 5338939392.

The previous prime is 20280513707. The next prime is 20280513709. The reversal of 20280513708 is 80731508202.

20280513708 is a `hidden beast` number, since 2 + 0 + 280 + 5 + 1 + 370 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (20280513707) and next prime (20280513709).

It is a super-2 number, since 2×20280513708² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20280513703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1884888 + ... + 1895616.

Almost surely, 2^20280513708 is an apocalyptic number.

20280513708 is a gapful number since it is divisible by the number (28) 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 20280513708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31605086240).

20280513708 is an abundant number, since it is smaller than the sum of its proper divisors (42929658772).

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

20280513708 is a wasteful number, since it uses less digits than its factorization.

20280513708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11336 (or 11331 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 20280513708 in words is "twenty billion, two hundred eighty million, five hundred thirteen thousand, seven hundred eight".