20122011 has 48 divisors (see below), whose sum is σ = 36341760. Its totient is φ = 10445760.

The previous prime is 20121989. The next prime is 20122031. The reversal of 20122011 is 11022102.

It is not a de Polignac number, because 20122011 - 2⁶ = 20121947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20121984 and 20122002.

It is not an unprimeable number, because it can be changed into a prime (20122031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64546 + ... + 64856.

It is an arithmetic number, because the mean of its divisors is an integer number (757120).

Almost surely, 2^20122011 is an apocalyptic number.

20122011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20122011 is a deficient number, since it is larger than the sum of its proper divisors (16219749).

20122011 is a wasteful number, since it uses less digits than its factorization.

20122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20122011 is about 4485.7564579455. The cubic root of 20122011 is about 271.9926243314.

Adding to 20122011 its reverse (11022102), we get a palindrome (31144113).

Subtracting from 20122011 its reverse (11022102), we obtain a palindrome (9099909).

The spelling of 20122011 in words is "twenty million, one hundred twenty-two thousand, eleven".