20606671820 has 24 divisors (see below), whose sum is σ = 49456012704. Its totient is φ = 7065144576.

The previous prime is 20606671817. The next prime is 20606671823. The reversal of 20606671820 is 2817660602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20606671817) and next prime (20606671823).

It is a super-2 number, since 2×20606671820² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20606671823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73595117 + ... + 73595396.

It is an arithmetic number, because the mean of its divisors is an integer number (2060667196).

Almost surely, 2^20606671820 is an apocalyptic number.

20606671820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20606671820 is an abundant number, since it is smaller than the sum of its proper divisors (28849340884).

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

20606671820 is a wasteful number, since it uses less digits than its factorization.

20606671820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147190529 (or 147190527 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 20606671820 in words is "twenty billion, six hundred six million, six hundred seventy-one thousand, eight hundred twenty".