20011020123 has 8 divisors (see below), whose sum is σ = 27301857088. Its totient is φ = 13030431624.

The previous prime is 20011020109. The next prime is 20011020137. The reversal of 20011020123 is 32102011002.

It is an interprime number because it is at equal distance from previous prime (20011020109) and next prime (20011020137).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20011020123 - 2⁸ = 20011019867 is a prime.

It is a super-2 number, since 2×20011020123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011020099 and 20011020108.

It is not an unprimeable number, because it can be changed into a prime (20011020143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77561965 + ... + 77562222.

It is an arithmetic number, because the mean of its divisors is an integer number (3412732136).

Almost surely, 2^20011020123 is an apocalyptic number.

20011020123 is a deficient number, since it is larger than the sum of its proper divisors (7290836965).

20011020123 is a wasteful number, since it uses less digits than its factorization.

20011020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155124233.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20011020123 its reverse (32102011002), we get a palindrome (52113031125).

The spelling of 20011020123 in words is "twenty billion, eleven million, twenty thousand, one hundred twenty-three".