20265515811 has 12 divisors (see below), whose sum is σ = 29276072592. Its totient is φ = 13508654256.

The previous prime is 20265515773. The next prime is 20265515813. The reversal of 20265515811 is 11851556202.

20265515811 is a `hidden beast` number, since 2 + 0 + 2 + 65 + 515 + 81 + 1 = 666.

It is not a de Polignac number, because 20265515811 - 2¹⁷ = 20265384739 is a prime.

It is a super-2 number, since 2×20265515811² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20265515813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62551 + ... + 210816.

It is an arithmetic number, because the mean of its divisors is an integer number (2439672716).

Almost surely, 2^20265515811 is an apocalyptic number.

20265515811 is a deficient number, since it is larger than the sum of its proper divisors (9010556781).

20265515811 is a wasteful number, since it uses less digits than its factorization.

20265515811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281610 (or 281607 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The spelling of 20265515811 in words is "twenty billion, two hundred sixty-five million, five hundred fifteen thousand, eight hundred eleven".