20205047555 has 16 divisors (see below), whose sum is σ = 30228850944. Its totient is φ = 12595354080.

The previous prime is 20205047501. The next prime is 20205047573. The reversal of 20205047555 is 55574050202.

It is not a de Polignac number, because 20205047555 - 2¹² = 20205043459 is a prime.

It is a super-2 number, since 2×20205047555² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian 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, 26239937 + ... + 26240706.

It is an arithmetic number, because the mean of its divisors is an integer number (1889303184).

Almost surely, 2^20205047555 is an apocalyptic number.

20205047555 is a deficient number, since it is larger than the sum of its proper divisors (10023803389).

20205047555 is a wasteful number, since it uses less digits than its factorization.

20205047555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52480666.

The product of its (nonzero) digits is 70000, while the sum is 35.

Adding to 20205047555 its reverse (55574050202), we get a palindrome (75779097757).

The spelling of 20205047555 in words is "twenty billion, two hundred five million, forty-seven thousand, five hundred fifty-five".