20654212440 has 64 divisors (see below), whose sum is σ = 62235682560. Its totient is φ = 5483519360.

The previous prime is 20654212421. The next prime is 20654212457. The reversal of 20654212440 is 4421245602.

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 = 20654212398 and 20654212407.

It is a congruent number.

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, 351876 + ... + 406355.

It is an arithmetic number, because the mean of its divisors is an integer number (972432540).

Almost surely, 2^20654212440 is an apocalyptic number.

20654212440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20654212440 is an abundant number, since it is smaller than the sum of its proper divisors (41581470120).

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

20654212440 is a wasteful number, since it uses less digits than its factorization.

20654212440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758472 (or 758468 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 20654212440 in words is "twenty billion, six hundred fifty-four million, two hundred twelve thousand, four hundred forty".