1020012636 has 24 divisors (see below), whose sum is σ = 2398201344. Its totient is φ = 337408240.

The previous prime is 1020012619. The next prime is 1020012661. The reversal of 1020012636 is 6362100201.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322860 + ... + 326003.

It is an arithmetic number, because the mean of its divisors is an integer number (99925056).

Almost surely, 2^1020012636 is an apocalyptic number.

It is an amenable number.

1020012636 is an abundant number, since it is smaller than the sum of its proper divisors (1378188708).

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

1020012636 is a wasteful number, since it uses less digits than its factorization.

1020012636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649001 (or 648999 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1020012636 is about 31937.6366689835. The cubic root of 1020012636 is about 1006.6268663026.

Adding to 1020012636 its reverse (6362100201), we get a palindrome (7382112837).

The spelling of 1020012636 in words is "one billion, twenty million, twelve thousand, six hundred thirty-six".