20401252120244 has 24 divisors (see below), whose sum is σ = 37820416261320. Its totient is φ = 9595993383936.

The previous prime is 20401252120213. The next prime is 20401252120259. The reversal of 20401252120244 is 44202125210402.

It can be written as a sum of positive squares in 4 ways, for example, as 7459245870244 + 12942006250000 = 2731162^2 + 3597500^2 .

It is a super-2 number, since 2×20401252120244² (a number of 27 digits) contains 22 as substring.

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, 71667047 + ... + 71951150.

It is an arithmetic number, because the mean of its divisors is an integer number (1575850677555).

Almost surely, 2^{20401252120244} is an apocalyptic number.

It is an amenable number.

20401252120244 is a deficient number, since it is larger than the sum of its proper divisors (17419164141076).

20401252120244 is a wasteful number, since it uses less digits than its factorization.

20401252120244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143620307 (or 143620305 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 20401252120244 its reverse (44202125210402), we get a palindrome (64603377330646).

The spelling of 20401252120244 in words is "twenty trillion, four hundred one billion, two hundred fifty-two million, one hundred twenty thousand, two hundred forty-four".