31154029920 has 768 divisors, whose sum is σ = 124366233600. Its totient is φ = 7226081280.

The previous prime is 31154029903. The next prime is 31154029931. The reversal of 31154029920 is 2992045113.

31154029920 is a `hidden beast` number, since 3 + 1 + 1 + 540 + 2 + 99 + 20 = 666.

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 127 ways as a sum of consecutive naturals, for example, 114959385 + ... + 114959655.

It is an arithmetic number, because the mean of its divisors is an integer number (161935200).

Almost surely, 2^31154029920 is an apocalyptic number.

31154029920 is a gapful number since it is divisible by the number (30) 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 31154029920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62183116800).

31154029920 is an abundant number, since it is smaller than the sum of its proper divisors (93212203680).

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

31154029920 is a wasteful number, since it uses less digits than its factorization.

31154029920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 31154029920 in words is "thirty-one billion, one hundred fifty-four million, twenty-nine thousand, nine hundred twenty".