20515021146 has 40 divisors (see below), whose sum is σ = 46244167200. Its totient is φ = 6797383272.

The previous prime is 20515021139. The next prime is 20515021171. The reversal of 20515021146 is 64112051502.

20515021146 is a `hidden beast` number, since 2 + 0 + 515 + 0 + 2 + 1 + 146 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 352096 + ... + 406203.

It is an arithmetic number, because the mean of its divisors is an integer number (1156104180).

Almost surely, 2^20515021146 is an apocalyptic number.

20515021146 is an abundant number, since it is smaller than the sum of its proper divisors (25729146054).

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

20515021146 is a wasteful number, since it uses less digits than its factorization.

20515021146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758480 (or 758471 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 20515021146 its reverse (64112051502), we get a palindrome (84627072648).

The spelling of 20515021146 in words is "twenty billion, five hundred fifteen million, twenty-one thousand, one hundred forty-six".