20345212020 has 48 divisors (see below), whose sum is σ = 65104679808. Its totient is φ = 4650334080.

The previous prime is 20345211983. The next prime is 20345212021. The reversal of 20345212020 is 2021254302.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345212021) 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, 24220071 + ... + 24220910.

It is an arithmetic number, because the mean of its divisors is an integer number (1356347496).

Almost surely, 2^20345212020 is an apocalyptic number.

20345212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20345212020 is an abundant number, since it is smaller than the sum of its proper divisors (44759467788).

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

20345212020 is a wasteful number, since it uses less digits than its factorization.

20345212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48441000 (or 48440998 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 20345212020 its reverse (2021254302), we get a palindrome (22366466322).

The spelling of 20345212020 in words is "twenty billion, three hundred forty-five million, two hundred twelve thousand, twenty".