201515220 has 36 divisors (see below), whose sum is σ = 611263380. Its totient is φ = 53737344.

The previous prime is 201515219. The next prime is 201515239. The reversal of 201515220 is 22515102.

It can be written as a sum of positive squares in 2 ways, for example, as 35569296 + 165945924 = 5964^2 + 12882^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 201515193 and 201515202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 559585 + ... + 559944.

Almost surely, 2^201515220 is an apocalyptic number.

201515220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201515220 is an abundant number, since it is smaller than the sum of its proper divisors (409748160).

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

201515220 is a wasteful number, since it uses less digits than its factorization.

201515220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119544 (or 1119539 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 201515220 is about 14195.6056580901. The cubic root of 201515220 is about 586.2766770760.

The spelling of 201515220 in words is "two hundred one million, five hundred fifteen thousand, two hundred twenty".