20412212156 has 24 divisors (see below), whose sum is σ = 40857180000. Its totient is φ = 8741071872.

The previous prime is 20412212111. The next prime is 20412212173. The reversal of 20412212156 is 65121221402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256865 + ... + 326808.

It is an arithmetic number, because the mean of its divisors is an integer number (1702382500).

Almost surely, 2^20412212156 is an apocalyptic number.

It is an amenable number.

20412212156 is an abundant number, since it is smaller than the sum of its proper divisors (20444967844).

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

20412212156 is a wasteful number, since it uses less digits than its factorization.

20412212156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584933 (or 584931 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 20412212156 its reverse (65121221402), we get a palindrome (85533433558).

The spelling of 20412212156 in words is "twenty billion, four hundred twelve million, two hundred twelve thousand, one hundred fifty-six".