20621712049690 has 32 divisors (see below), whose sum is σ = 38145330565056. Its totient is φ = 8022276124800.

The previous prime is 20621712049669. The next prime is 20621712049711. The reversal of 20621712049690 is 9694021712602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20621712049669) and next prime (20621712049711).

It is a super-2 number, since 2×20621712049690² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102812836 + ... + 103013215.

It is an arithmetic number, because the mean of its divisors is an integer number (1192041580158).

Almost surely, 2^{20621712049690} is an apocalyptic number.

20621712049690 is a deficient number, since it is larger than the sum of its proper divisors (17523618515366).

20621712049690 is a wasteful number, since it uses less digits than its factorization.

20621712049690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205826334.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 20621712049690 in words is "twenty trillion, six hundred twenty-one billion, seven hundred twelve million, forty-nine thousand, six hundred ninety".