20011211020 has 48 divisors (see below), whose sum is σ = 44752847328. Its totient is φ = 7490063360.

The previous prime is 20011210993. The next prime is 20011211021. The reversal of 20011211020 is 2011211002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20011210988 and 20011211006.

It is not an unprimeable number, because it can be changed into a prime (20011211021) 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, 111286 + ... + 228925.

It is an arithmetic number, because the mean of its divisors is an integer number (932350986).

Almost surely, 2^20011211020 is an apocalyptic number.

20011211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011211020 is an abundant number, since it is smaller than the sum of its proper divisors (24741636308).

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

20011211020 is a wasteful number, since it uses less digits than its factorization.

20011211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340410 (or 340408 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20011211020 its reverse (2011211002), we get a palindrome (22022422022).

The spelling of 20011211020 in words is "twenty billion, eleven million, two hundred eleven thousand, twenty".