20511365325490 has 32 divisors (see below), whose sum is σ = 39760765677360. Its totient is φ = 7573375217664.

The previous prime is 20511365325389. The next prime is 20511365325547. The reversal of 20511365325490 is 9452356311502.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 16609480173729 + 3901885151761 = 4075473^2 + 1975319^2 .

It is a super-2 number, since 2×20511365325490² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20511365325490.

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, 22099906 + ... + 23009314.

Almost surely, 2^{20511365325490} is an apocalyptic number.

20511365325490 is a deficient number, since it is larger than the sum of its proper divisors (19249400351870).

20511365325490 is a wasteful number, since it uses less digits than its factorization.

20511365325490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082926.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 20511365325490 in words is "twenty trillion, five hundred eleven billion, three hundred sixty-five million, three hundred twenty-five thousand, four hundred ninety".