20136471156646 has 32 divisors (see below), whose sum is σ = 32551996538880. Its totient is φ = 9286942528416.

The previous prime is 20136471156629. The next prime is 20136471156721. The reversal of 20136471156646 is 64665117463102.

It is a junction number, because it is equal to n+sod(n) for n = 20136471156593 and 20136471156602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 731503335 + ... + 731530861.

It is an arithmetic number, because the mean of its divisors is an integer number (1017249891840).

Almost surely, 2^{20136471156646} is an apocalyptic number.

20136471156646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20136471156646 is a deficient number, since it is larger than the sum of its proper divisors (12415525382234).

20136471156646 is a wasteful number, since it uses less digits than its factorization.

20136471156646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47148.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 20136471156646 in words is "twenty trillion, one hundred thirty-six billion, four hundred seventy-one million, one hundred fifty-six thousand, six hundred forty-six".