2020181956 has 12 divisors (see below), whose sum is σ = 3807266092. Its totient is φ = 932391648.

The previous prime is 2020181953. The next prime is 2020181987. The reversal of 2020181956 is 6591810202.

It can be written as a sum of positive squares in 2 ways, for example, as 562164100 + 1458017856 = 23710^2 + 38184^2 .

It is a super-2 number, since 2×2020181956² = 8162270270695971872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2020181953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19424775 + ... + 19424878.

Almost surely, 2^2020181956 is an apocalyptic number.

2020181956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2020181956 is a deficient number, since it is larger than the sum of its proper divisors (1787084136).

2020181956 is a wasteful number, since it uses less digits than its factorization.

2020181956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38849670 (or 38849668 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 2020181956 is about 44946.4342968383. The cubic root of 2020181956 is about 1264.1448194710.

The spelling of 2020181956 in words is "two billion, twenty million, one hundred eighty-one thousand, nine hundred fifty-six".