199901020 has 48 divisors (see below), whose sum is σ = 472743936. Its totient is φ = 70344000.

The previous prime is 199901017. The next prime is 199901021. The reversal of 199901020 is 20109991.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199901021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7836 + ... + 21475.

It is an arithmetic number, because the mean of its divisors is an integer number (9848832).

Almost surely, 2^199901020 is an apocalyptic number.

199901020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199901020 is an abundant number, since it is smaller than the sum of its proper divisors (272842916).

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

199901020 is a wasteful number, since it uses less digits than its factorization.

199901020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29362 (or 29360 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 199901020 is about 14138.6357191916. The cubic root of 199901020 is about 584.7070586314.

The spelling of 199901020 in words is "one hundred ninety-nine million, nine hundred one thousand, twenty".