920181780 has 486 divisors, whose sum is σ = 3640246974. Its totient is φ = 187536384.

The previous prime is 920181739. The next prime is 920181791. The reversal of 920181780 is 87181029.

920181780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 308213136 + 611968644 = 17556^2 + 24738^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 161 ways as a sum of consecutive naturals, for example, 48430611 + ... + 48430629.

Almost surely, 2^920181780 is an apocalyptic number.

920181780 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 920181780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1820123487).

920181780 is an abundant number, since it is smaller than the sum of its proper divisors (2720065194).

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

920181780 is a wasteful number, since it uses less digits than its factorization.

920181780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 920181780 is about 30334.4981827621. The cubic root of 920181780 is about 972.6528789558.

The spelling of 920181780 in words is "nine hundred twenty million, one hundred eighty-one thousand, seven hundred eighty".