20234157990 has 32 divisors (see below), whose sum is σ = 48568022496. Its totient is φ = 5395104000.

The previous prime is 20234157989. The next prime is 20234157997. The reversal of 20234157990 is 9975143202.

It is a super-2 number, since 2×20234157990² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20234157997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232564 + ... + 307496.

It is an arithmetic number, because the mean of its divisors is an integer number (1517750703).

Almost surely, 2^20234157990 is an apocalyptic number.

20234157990 is an abundant number, since it is smaller than the sum of its proper divisors (28333864506).

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

20234157990 is a wasteful number, since it uses less digits than its factorization.

20234157990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83944.

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 20234157990 in words is "twenty billion, two hundred thirty-four million, one hundred fifty-seven thousand, nine hundred ninety".