20281028381901 has 12 divisors (see below), whose sum is σ = 33479792884512. Its totient is φ = 11589159075336.

The previous prime is 20281028381843. The next prime is 20281028381927. The reversal of 20281028381901 is 10918382018202.

20281028381901 is a `hidden beast` number, since 2 + 0 + 281 + 0 + 283 + 8 + 1 + 90 + 1 = 666.

It is not a de Polignac number, because 20281028381901 - 2¹⁵ = 20281028349133 is a prime.

It is a super-2 number, since 2×20281028381901² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281028381501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160960542651 + ... + 160960542776.

It is an arithmetic number, because the mean of its divisors is an integer number (2789982740376).

Almost surely, 2^{20281028381901} is an apocalyptic number.

20281028381901 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20281028381901 is a deficient number, since it is larger than the sum of its proper divisors (13198764502611).

20281028381901 is a wasteful number, since it uses less digits than its factorization.

20281028381901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321921085440 (or 321921085437 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 20281028381901 in words is "twenty trillion, two hundred eighty-one billion, twenty-eight million, three hundred eighty-one thousand, nine hundred one".