210000020 has 24 divisors (see below), whose sum is σ = 456208200. Its totient is φ = 81103232.

The previous prime is 210000017. The next prime is 210000023. The reversal of 210000020 is 20000012.

It is an interprime number because it is at equal distance from previous prime (210000017) and next prime (210000023).

It can be written as a sum of positive squares in 4 ways, for example, as 26234884 + 183765136 = 5122^2 + 13556^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 209999959 and 210000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180455 + ... + 181614.

It is an arithmetic number, because the mean of its divisors is an integer number (19008675).

Almost surely, 2^210000020 is an apocalyptic number.

210000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210000020 is an abundant number, since it is smaller than the sum of its proper divisors (246208180).

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

210000020 is a wasteful number, since it uses less digits than its factorization.

210000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362107 (or 362105 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 210000020 is about 14491.3774362550. The cubic root of 210000020 is about 594.3922141459.

Adding to 210000020 its reverse (20000012), we get a palindrome (230000032).

The spelling of 210000020 in words is "two hundred ten million, twenty", and thus it is an aban number.