1201512020 has 24 divisors (see below), whose sum is σ = 2581855584. Its totient is φ = 469427616.

The previous prime is 1201512017. The next prime is 1201512023. The reversal of 1201512020 is 202151021.

It is an interprime number because it is at equal distance from previous prime (1201512017) and next prime (1201512023).

It is a super-2 number, since 2×1201512020² = 2887262268408960800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201511986 and 1201512004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201512023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697694 + ... + 699413.

It is an arithmetic number, because the mean of its divisors is an integer number (107577316).

Almost surely, 2^1201512020 is an apocalyptic number.

1201512020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201512020 is an abundant number, since it is smaller than the sum of its proper divisors (1380343564).

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

1201512020 is a wasteful number, since it uses less digits than its factorization.

1201512020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397159 (or 1397157 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1201512020 is about 34662.8334098642. The cubic root of 1201512020 is about 1063.1047043585.

Adding to 1201512020 its reverse (202151021), we get a palindrome (1403663041).

The spelling of 1201512020 in words is "one billion, two hundred one million, five hundred twelve thousand, twenty".