20455533640040 has 32 divisors (see below), whose sum is σ = 46480643280360. Its totient is φ = 8101201440000.

The previous prime is 20455533639923. The next prime is 20455533640057. The reversal of 20455533640040 is 4004633555402.

It can be written as a sum of positive squares in 4 ways, for example, as 20264384553604 + 191149086436 = 4501598^2 + 437206^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20455533640040.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2531621411 + ... + 2531629490.

Almost surely, 2^{20455533640040} is an apocalyptic number.

20455533640040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20455533640040 is an abundant number, since it is smaller than the sum of its proper divisors (26025109640320).

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

20455533640040 is a wasteful number, since it uses less digits than its factorization.

20455533640040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5063251013 (or 5063251009 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 41.

The spelling of 20455533640040 in words is "twenty trillion, four hundred fifty-five billion, five hundred thirty-three million, six hundred forty thousand, forty".