1012155020 has 48 divisors (see below), whose sum is σ = 2231712000. Its totient is φ = 384854976.

The previous prime is 1012155019. The next prime is 1012155047. The reversal of 1012155020 is 205512101.

It is a super-2 number, since 2×1012155020² = 2048915569022400800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1012155020.

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, 68231 + ... + 81729.

It is an arithmetic number, because the mean of its divisors is an integer number (46494000).

Almost surely, 2^1012155020 is an apocalyptic number.

1012155020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1012155020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1115856000).

1012155020 is an abundant number, since it is smaller than the sum of its proper divisors (1219556980).

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

1012155020 is a wasteful number, since it uses less digits than its factorization.

1012155020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13694 (or 13692 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1012155020 is about 31814.3838538482. The cubic root of 1012155020 is about 1004.0353672403.

Adding to 1012155020 its reverse (205512101), we get a palindrome (1217667121).

The spelling of 1012155020 in words is "one billion, twelve million, one hundred fifty-five thousand, twenty".