20654542440 has 96 divisors (see below), whose sum is σ = 76716881280. Its totient is φ = 4721037696.

The previous prime is 20654542427. The next prime is 20654542457. The reversal of 20654542440 is 4424545602.

20654542440 is a `hidden beast` number, since 20 + 6 + 54 + 542 + 4 + 40 = 666.

It is a super-2 number, since 2×20654542440² (a number of 21 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 20654542395 and 20654542404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4095604 + ... + 4100643.

It is an arithmetic number, because the mean of its divisors is an integer number (799134180).

Almost surely, 2^20654542440 is an apocalyptic number.

20654542440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20654542440 is an abundant number, since it is smaller than the sum of its proper divisors (56062338840).

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

20654542440 is a wasteful number, since it uses less digits than its factorization.

20654542440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8196271 (or 8196264 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 36.

The spelling of 20654542440 in words is "twenty billion, six hundred fifty-four million, five hundred forty-two thousand, four hundred forty".