20147785123412 has 6 divisors (see below), whose sum is σ = 35258623965978. Its totient is φ = 10073892561704.

The previous prime is 20147785123393. The next prime is 20147785123451. The reversal of 20147785123412 is 21432158774102.

It can be written as a sum of positive squares in only one way, i.e., 11637472567876 + 8510312555536 = 3411374^2 + 2917244^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2518473140423 + ... + 2518473140430.

It is an arithmetic number, because the mean of its divisors is an integer number (5876437327663).

Almost surely, 2^{20147785123412} is an apocalyptic number.

It is an amenable number.

20147785123412 is a deficient number, since it is larger than the sum of its proper divisors (15110838842566).

20147785123412 is a wasteful number, since it uses less digits than its factorization.

20147785123412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5036946280857 (or 5036946280855 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 20147785123412 in words is "twenty trillion, one hundred forty-seven billion, seven hundred eighty-five million, one hundred twenty-three thousand, four hundred twelve".