20213312240 has 40 divisors (see below), whose sum is σ = 51268312368. Its totient is φ = 7350295040.

The previous prime is 20213312221. The next prime is 20213312309. The reversal of 20213312240 is 4221331202.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11483957 + ... + 11485716.

Almost surely, 2^20213312240 is an apocalyptic number.

20213312240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20213312240 is an abundant number, since it is smaller than the sum of its proper divisors (31055000128).

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

20213312240 is a wasteful number, since it uses less digits than its factorization.

20213312240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22969697 (or 22969691 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20213312240 its reverse (4221331202), we get a palindrome (24434643442).

The spelling of 20213312240 in words is "twenty billion, two hundred thirteen million, three hundred twelve thousand, two hundred forty".