1601705220 has 48 divisors (see below), whose sum is σ = 4506065088. Its totient is φ = 425093760.

The previous prime is 1601705219. The next prime is 1601705239. The reversal of 1601705220 is 225071061.

It is a super-2 number, since 2×1601705220² = 5130919223550496800, which contains 22 as substring.

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, 50599 + ... + 75918.

It is an arithmetic number, because the mean of its divisors is an integer number (93876356).

Almost surely, 2^1601705220 is an apocalyptic number.

1601705220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601705220 is an abundant number, since it is smaller than the sum of its proper divisors (2904359868).

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

1601705220 is a wasteful number, since it uses less digits than its factorization.

1601705220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126740 (or 126738 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1601705220 is about 40021.3095737758. The cubic root of 1601705220 is about 1170.0224555556.

Adding to 1601705220 its reverse (225071061), we get a palindrome (1826776281).

The spelling of 1601705220 in words is "one billion, six hundred one million, seven hundred five thousand, two hundred twenty".