20011813801920 has 224 divisors, whose sum is σ = 74750010926400. Its totient is φ = 5022572838912.

The previous prime is 20011813801883. The next prime is 20011813801927. The reversal of 20011813801920 is 2910831811002.

It is a happy number.

20011813801920 is a `hidden beast` number, since 2 + 0 + 0 + 11 + 81 + 380 + 192 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011813801927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67976125 + ... + 68269884.

Almost surely, 2^{20011813801920} is an apocalyptic number.

20011813801920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011813801920 is an abundant number, since it is smaller than the sum of its proper divisors (54738197124480).

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

20011813801920 is a wasteful number, since it uses less digits than its factorization.

20011813801920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136246052 (or 136246036 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 20011813801920 in words is "twenty trillion, eleven billion, eight hundred thirteen million, eight hundred one thousand, nine hundred twenty".