309400122020 has 192 divisors, whose sum is σ = 734701363200. Its totient is φ = 108461283840.

The previous prime is 309400122013. The next prime is 309400122029. The reversal of 309400122020 is 20221004903.

It is not an unprimeable number, because it can be changed into a prime (309400122029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 698419919 + ... + 698420361.

It is an arithmetic number, because the mean of its divisors is an integer number (3826569600).

Almost surely, 2^309400122020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309400122020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367350681600).

309400122020 is an abundant number, since it is smaller than the sum of its proper divisors (425301241180).

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

309400122020 is a wasteful number, since it uses less digits than its factorization.

309400122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 309400122020 its reverse (20221004903), we get a palindrome (329621126923).

The spelling of 309400122020 in words is "three hundred nine billion, four hundred million, one hundred twenty-two thousand, twenty".