20278378340 has 48 divisors (see below), whose sum is σ = 46468344384. Its totient is φ = 7371984000.

The previous prime is 20278378333. The next prime is 20278378357. The reversal of 20278378340 is 4387387202.

It is a super-2 number, since 2×20278378340² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 20278378291 and 20278378300.

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, 1001315 + ... + 1021365.

It is an arithmetic number, because the mean of its divisors is an integer number (968090508).

Almost surely, 2^20278378340 is an apocalyptic number.

20278378340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20278378340 is an abundant number, since it is smaller than the sum of its proper divisors (26189966044).

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

20278378340 is a wasteful number, since it uses less digits than its factorization.

20278378340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24668 (or 24666 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 44.

The spelling of 20278378340 in words is "twenty billion, two hundred seventy-eight million, three hundred seventy-eight thousand, three hundred forty".