20000061 has 16 divisors (see below), whose sum is σ = 30049920. Its totient is φ = 13144320.

The previous prime is 20000059. The next prime is 20000063. The reversal of 20000061 is 16000002.

It is an interprime number because it is at equal distance from previous prime (20000059) and next prime (20000063).

It is not a de Polignac number, because 20000061 - 2¹ = 20000059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19999998 and 20000052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3300 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (1878120).

Almost surely, 2^20000061 is an apocalyptic number.

It is an amenable number.

20000061 is a deficient number, since it is larger than the sum of its proper divisors (10049859).

20000061 is a wasteful number, since it uses less digits than its factorization.

20000061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10513 (or 10507 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20000061 is about 4472.1427750017. The cubic root of 20000061 is about 271.4420376250.

Adding to 20000061 its reverse (16000002), we get a palindrome (36000063).

The spelling of 20000061 in words is "twenty million, sixty-one", and thus it is an aban number and an uban number.