20355656520070 has 32 divisors (see below), whose sum is σ = 37003936773600. Its totient is φ = 8061777335040.

The previous prime is 20355656520037. The next prime is 20355656520071. The reversal of 20355656520070 is 7002565655302.

It is a self number, because there is not a number n which added to its sum of digits gives 20355656520070.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355656520071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21357136 + ... + 22289875.

It is an arithmetic number, because the mean of its divisors is an integer number (1156373024175).

Almost surely, 2^{20355656520070} is an apocalyptic number.

20355656520070 is a deficient number, since it is larger than the sum of its proper divisors (16648280253530).

20355656520070 is a wasteful number, since it uses less digits than its factorization.

20355656520070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43647480.

The product of its (nonzero) digits is 1890000, while the sum is 46.

The spelling of 20355656520070 in words is "twenty trillion, three hundred fifty-five billion, six hundred fifty-six million, five hundred twenty thousand, seventy".