20061620100 has 108 divisors (see below), whose sum is σ = 66581027604. Its totient is φ = 5035069440.

The previous prime is 20061620099. The next prime is 20061620101. The reversal of 20061620100 is 102616002.

It is a happy number.

20061620100 is a `hidden beast` number, since 20 + 0 + 616 + 20 + 10 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20061620099) and next prime (20061620101).

It can be written as a sum of positive squares in 6 ways, for example, as 99321156 + 19962298944 = 9966^2 + 141288^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20061620101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 640309 + ... + 670908.

Almost surely, 2^20061620100 is an apocalyptic number.

20061620100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20061620100 is an abundant number, since it is smaller than the sum of its proper divisors (46519407504).

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

20061620100 is a wasteful number, since it uses less digits than its factorization.

20061620100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311254 (or 1311244 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The spelling of 20061620100 in words is "twenty billion, sixty-one million, six hundred twenty thousand, one hundred".