20231554440 has 64 divisors (see below), whose sum is σ = 60704179200. Its totient is φ = 5394235392.

The previous prime is 20231554439. The next prime is 20231554487. The reversal of 20231554440 is 4445513202.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20231554398 and 20231554407.

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, 1282521 + ... + 1298199.

It is an arithmetic number, because the mean of its divisors is an integer number (948502800).

Almost surely, 2^20231554440 is an apocalyptic number.

20231554440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20231554440 is an abundant number, since it is smaller than the sum of its proper divisors (40472624760).

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

20231554440 is a wasteful number, since it uses less digits than its factorization.

20231554440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26446 (or 26442 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 20231554440 in words is "twenty billion, two hundred thirty-one million, five hundred fifty-four thousand, four hundred forty".