20767211220 has 96 divisors (see below), whose sum is σ = 70364222208. Its totient is φ = 4467566592.

The previous prime is 20767211219. The next prime is 20767211239. The reversal of 20767211220 is 2211276702.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1447147 + ... + 1461426.

It is an arithmetic number, because the mean of its divisors is an integer number (732960648).

Almost surely, 2^20767211220 is an apocalyptic number.

20767211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20767211220 is an abundant number, since it is smaller than the sum of its proper divisors (49597010988).

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

20767211220 is a wasteful number, since it uses less digits than its factorization.

20767211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908609 (or 2908607 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

Adding to 20767211220 its reverse (2211276702), we get a palindrome (22978487922).

The spelling of 20767211220 in words is "twenty billion, seven hundred sixty-seven million, two hundred eleven thousand, two hundred twenty".