20370878854921 has 27 divisors (see below), whose sum is σ = 23755870793109. Its totient is φ = 17417289156288.

The previous prime is 20370878854903. The next prime is 20370878854969. The reversal of 20370878854921 is 12945887807302.

The square root of 20370878854921 is 4513411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3340103484025 + 17030775370896 = 1827595^2 + 4126836^2 .

It is not a de Polignac number, because 20370878854921 - 2¹⁵ = 20370878822153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20370878854321) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 25180319565 + ... + 25180320373.

Almost surely, 2^{20370878854921} is an apocalyptic number.

20370878854921 is the 4513411-st square number.

20370878854921 is the 2256706-th centered octagonal number.

It is an amenable number.

20370878854921 is a deficient number, since it is larger than the sum of its proper divisors (3384991938188).

20370878854921 is an frugal number, since it uses more digits than its factorization.

20370878854921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226 (or 1613 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 64.

The spelling of 20370878854921 in words is "twenty trillion, three hundred seventy billion, eight hundred seventy-eight million, eight hundred fifty-four thousand, nine hundred twenty-one".