102009201020 has 24 divisors (see below), whose sum is σ = 214226785584. Its totient is φ = 40802258816.

The previous prime is 102009201017. The next prime is 102009201101. The reversal of 102009201020 is 20102900201.

It is a self number, because there is not a number n which added to its sum of digits gives 102009201020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 649007 + ... + 790713.

It is an arithmetic number, because the mean of its divisors is an integer number (8926116066).

Almost surely, 2^102009201020 is an apocalyptic number.

102009201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102009201020 is an abundant number, since it is smaller than the sum of its proper divisors (112217584564).

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

102009201020 is a wasteful number, since it uses less digits than its factorization.

102009201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177709 (or 177707 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 102009201020 in words is "one hundred two billion, nine million, two hundred one thousand, twenty".